diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index bdfc06cce4..2df4b8d580 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -40,7 +40,7 @@
     "codemirror": "5.28.0",
     "coveralls": "2.13.1",
     "csscomb": "4.2.0",
-    "cssnano": "3.10.0",
+    "cssnano": "4.0.0-rc.2",
     "ember-ajax": "2.5.6",
     "ember-browserify": "1.2.0",
     "ember-cli": "2.14.2",
@@ -58,7 +58,7 @@
     "ember-cli-mocha": "0.14.4",
     "ember-cli-moment-shim": "3.1.0",
     "ember-cli-node-assets": "0.2.2",
-    "ember-cli-postcss": "3.5.0",
+    "ember-cli-postcss": "3.5.1",
     "ember-cli-pretender": "1.0.1",
     "ember-cli-selectize": "0.5.12",
     "ember-cli-shims": "1.1.0",
@@ -112,8 +112,8 @@
     "markdown-it-named-headers": "0.0.4",
     "matchdep": "1.0.1",
     "password-generator": "2.1.0",
-    "postcss-color-function": "3.0.0",
-    "postcss-custom-properties": "5.0.2",
+    "postcss-color-function": "4.0.0",
+    "postcss-custom-properties": "6.1.0",
     "postcss-easy-import": "2.1.0",
     "simplemde": "https://github.com/kevinansfield/simplemde-markdown-editor.git#ghost",
     "top-gh-contribs": "2.0.4",
diff --git a/ghost/admin/yarn.lock b/ghost/admin/yarn.lock
index 00c5f43ebd..55cfe02f14 100644
--- a/ghost/admin/yarn.lock
+++ b/ghost/admin/yarn.lock
@@ -159,7 +159,7 @@ align-text@^0.1.1, align-text@^0.1.3:
     longest "^1.0.1"
     repeat-string "^1.5.2"
 
-alphanum-sort@^1.0.1, alphanum-sort@^1.0.2:
+alphanum-sort@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/alphanum-sort/-/alphanum-sort-1.0.2.tgz#97a1119649b211ad33691d9f9f486a8ec9fbe0a3"
 
@@ -247,6 +247,10 @@ are-we-there-yet@~1.1.2:
     delegates "^1.0.0"
     readable-stream "^2.0.6"
 
+argh@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/argh/-/argh-0.1.4.tgz#3eb4d612973fc6b6dc6ef338f56f759f2ac5c3a6"
+
 argparse@^1.0.2, argparse@^1.0.7:
   version "1.0.9"
   resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.9.tgz#73d83bc263f86e97f8cc4f6bae1b0e90a7d22c86"
@@ -419,17 +423,6 @@ autoprefixer@7.1.2:
     postcss "^6.0.6"
     postcss-value-parser "^3.2.3"
 
-autoprefixer@^6.3.1:
-  version "6.7.7"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-6.7.7.tgz#1dbd1c835658e35ce3f9984099db00585c782014"
-  dependencies:
-    browserslist "^1.7.6"
-    caniuse-db "^1.0.30000634"
-    normalize-range "^0.1.2"
-    num2fraction "^1.2.2"
-    postcss "^5.2.16"
-    postcss-value-parser "^3.2.3"
-
 aws-sign2@~0.6.0:
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/aws-sign2/-/aws-sign2-0.6.0.tgz#14342dd38dbcc94d0e5b87d763cd63612c0e794f"
@@ -1098,10 +1091,6 @@ balanced-match@0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.1.0.tgz#b504bd05869b39259dd0c5efc35d843176dccc4a"
 
-balanced-match@^0.4.2:
-  version "0.4.2"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.4.2.tgz#cb3f3e3c732dc0f01ee70b403f302e61d7709838"
-
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
@@ -1785,12 +1774,12 @@ browserify@^13.0.0:
     vm-browserify "~0.0.1"
     xtend "^4.0.0"
 
-browserslist@^1.3.6, browserslist@^1.5.2, browserslist@^1.7.6:
-  version "1.7.7"
-  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-1.7.7.tgz#0bd76704258be829b2398bb50e4b62d1a166b0b9"
+browserslist@^2.0.0:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-2.3.3.tgz#2b0cabc4d28489f682598605858a0782f14b154c"
   dependencies:
-    caniuse-db "^1.0.30000639"
-    electron-to-chromium "^1.2.7"
+    caniuse-lite "^1.0.30000715"
+    electron-to-chromium "^1.3.18"
 
 browserslist@^2.1.2, browserslist@^2.1.5:
   version "2.3.1"
@@ -1890,20 +1879,16 @@ can-symlink@^1.0.0:
   dependencies:
     tmp "0.0.28"
 
-caniuse-api@^1.5.2:
-  version "1.6.1"
-  resolved "https://registry.yarnpkg.com/caniuse-api/-/caniuse-api-1.6.1.tgz#b534e7c734c4f81ec5fbe8aca2ad24354b962c6c"
+caniuse-api@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/caniuse-api/-/caniuse-api-2.0.0.tgz#b1ddb5a5966b16f48dc4998444d4bbc6c7d9d834"
   dependencies:
-    browserslist "^1.3.6"
-    caniuse-db "^1.0.30000529"
+    browserslist "^2.0.0"
+    caniuse-lite "^1.0.0"
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-db@^1.0.30000529, caniuse-db@^1.0.30000634, caniuse-db@^1.0.30000639:
-  version "1.0.30000715"
-  resolved "https://registry.yarnpkg.com/caniuse-db/-/caniuse-db-1.0.30000715.tgz#0b9b5c795950dfbaf301a8806bafe87f126da8ca"
-
-caniuse-lite@^1.0.30000697, caniuse-lite@^1.0.30000712:
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000697, caniuse-lite@^1.0.30000712, caniuse-lite@^1.0.30000715:
   version "1.0.30000715"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000715.tgz#c327f5e6d907ebcec62cde598c3bf0dd793fb9a0"
 
@@ -1967,7 +1952,7 @@ chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3, chalk@~1.1.1:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chalk@^2.0.0, chalk@^2.0.1:
+chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.1.0.tgz#ac5becf14fa21b99c6c92ca7a7d7cfd5b17e743e"
   dependencies:
@@ -2114,7 +2099,7 @@ coffee-script@~1.10.0:
   version "1.10.0"
   resolved "https://registry.yarnpkg.com/coffee-script/-/coffee-script-1.10.0.tgz#12938bcf9be1948fa006f92e0c4c9e81705108c0"
 
-color-convert@^1.3.0, color-convert@^1.9.0:
+color-convert@^1.3.0, color-convert@^1.8.2, color-convert@^1.9.0:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.0.tgz#1accf97dd739b983bf994d56fec8f95853641b7a"
   dependencies:
@@ -2130,6 +2115,13 @@ color-string@^0.3.0:
   dependencies:
     color-name "^1.0.0"
 
+color-string@^1.4.0:
+  version "1.5.2"
+  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.5.2.tgz#26e45814bc3c9a7cbd6751648a41434514a773a9"
+  dependencies:
+    color-name "^1.0.0"
+    simple-swizzle "^0.2.2"
+
 color@^0.11.0:
   version "0.11.4"
   resolved "https://registry.yarnpkg.com/color/-/color-0.11.4.tgz#6d7b5c74fb65e841cd48792ad1ed5e07b904d764"
@@ -2138,13 +2130,12 @@ color@^0.11.0:
     color-convert "^1.3.0"
     color-string "^0.3.0"
 
-colormin@^1.0.5:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/colormin/-/colormin-1.1.2.tgz#ea2f7420a72b96881a38aae59ec124a6f7298133"
+color@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/color/-/color-1.0.3.tgz#e48e832d85f14ef694fb468811c2d5cfe729b55d"
   dependencies:
-    color "^0.11.0"
-    css-color-names "0.0.4"
-    has "^1.0.1"
+    color-convert "^1.8.2"
+    color-string "^1.4.0"
 
 colors@1.0.3:
   version "1.0.3"
@@ -2349,6 +2340,18 @@ core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
+cosmiconfig@^2.0.0:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-2.2.2.tgz#6173cebd56fac042c1f4390edf7af6c07c7cb892"
+  dependencies:
+    is-directory "^0.3.1"
+    js-yaml "^3.4.3"
+    minimist "^1.2.0"
+    object-assign "^4.1.0"
+    os-homedir "^1.0.1"
+    parse-json "^2.2.0"
+    require-from-string "^1.1.0"
+
 coveralls@2.13.1:
   version "2.13.1"
   resolved "https://registry.yarnpkg.com/coveralls/-/coveralls-2.13.1.tgz#d70bb9acc1835ec4f063ff9dac5423c17b11f178"
@@ -2423,7 +2426,7 @@ crypto@0.0.3:
   version "0.0.3"
   resolved "https://registry.yarnpkg.com/crypto/-/crypto-0.0.3.tgz#470a81b86be4c5ee17acc8207a1f5315ae20dbb0"
 
-css-color-function@^1.2.0:
+css-color-function@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/css-color-function/-/css-color-function-1.3.0.tgz#72c767baf978f01b8a8a94f42f17ba5d22a776fc"
   dependencies:
@@ -2432,10 +2435,24 @@ css-color-function@^1.2.0:
     debug "~0.7.4"
     rgb "~0.1.0"
 
-css-color-names@0.0.4:
+css-color-names@^0.0.4:
   version "0.0.4"
   resolved "https://registry.yarnpkg.com/css-color-names/-/css-color-names-0.0.4.tgz#808adc2e79cf84738069b646cb20ec27beb629e0"
 
+css-declaration-sorter@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/css-declaration-sorter/-/css-declaration-sorter-2.0.1.tgz#5d5455d773ba9e6a31de81f58a2021f7a0e11093"
+  dependencies:
+    argh "^0.1.4"
+    postcss "^6.0.0"
+    read-file-stdin "^0.2.0"
+    timsort "^0.3.0"
+    write-file-stdout "0.0.2"
+
+css-unit-converter@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/css-unit-converter/-/css-unit-converter-1.1.1.tgz#d9b9281adcfd8ced935bdbaba83786897f64e996"
+
 csscomb@4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/csscomb/-/csscomb-4.2.0.tgz#5f948bc94afa61c033c3984e4192f0e6fef67fdb"
@@ -2448,42 +2465,67 @@ csscomb@4.2.0:
     vow "0.4.4"
     vow-fs "0.3.6"
 
-cssnano@3.10.0:
-  version "3.10.0"
-  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-3.10.0.tgz#4f38f6cea2b9b17fa01490f23f1dc68ea65c1c38"
+cssnano-preset-default@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-4.0.0-rc.2.tgz#c5f38cdf858fa6e00e52186f77a96c6be48bbced"
   dependencies:
-    autoprefixer "^6.3.1"
-    decamelize "^1.1.2"
-    defined "^1.0.0"
-    has "^1.0.1"
-    object-assign "^4.0.1"
-    postcss "^5.0.14"
-    postcss-calc "^5.2.0"
-    postcss-colormin "^2.1.8"
-    postcss-convert-values "^2.3.4"
-    postcss-discard-comments "^2.0.4"
-    postcss-discard-duplicates "^2.0.1"
-    postcss-discard-empty "^2.0.1"
-    postcss-discard-overridden "^0.1.1"
-    postcss-discard-unused "^2.2.1"
-    postcss-filter-plugins "^2.0.0"
-    postcss-merge-idents "^2.1.5"
-    postcss-merge-longhand "^2.0.1"
-    postcss-merge-rules "^2.0.3"
-    postcss-minify-font-values "^1.0.2"
-    postcss-minify-gradients "^1.0.1"
-    postcss-minify-params "^1.0.4"
-    postcss-minify-selectors "^2.0.4"
-    postcss-normalize-charset "^1.1.0"
-    postcss-normalize-url "^3.0.7"
-    postcss-ordered-values "^2.1.0"
-    postcss-reduce-idents "^2.2.2"
-    postcss-reduce-initial "^1.0.0"
-    postcss-reduce-transforms "^1.0.3"
-    postcss-svgo "^2.1.1"
-    postcss-unique-selectors "^2.0.2"
-    postcss-value-parser "^3.2.3"
-    postcss-zindex "^2.0.1"
+    css-declaration-sorter "^2.0.1"
+    cssnano-util-raw-cache "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-calc "^6.0.0"
+    postcss-colormin "^4.0.0-rc.2"
+    postcss-convert-values "^4.0.0-rc.2"
+    postcss-discard-comments "^4.0.0-rc.2"
+    postcss-discard-duplicates "^4.0.0-rc.2"
+    postcss-discard-empty "^4.0.0-rc.2"
+    postcss-discard-overridden "^4.0.0-rc.2"
+    postcss-merge-longhand "^4.0.0-rc.2"
+    postcss-merge-rules "^4.0.0-rc.2"
+    postcss-minify-font-values "^4.0.0-rc.2"
+    postcss-minify-gradients "^4.0.0-rc.2"
+    postcss-minify-params "^4.0.0-rc.2"
+    postcss-minify-selectors "^4.0.0-rc.2"
+    postcss-normalize-charset "^4.0.0-rc.2"
+    postcss-normalize-display-values "^4.0.0-rc.2"
+    postcss-normalize-positions "^4.0.0-rc.2"
+    postcss-normalize-repeat-style "^4.0.0-rc.2"
+    postcss-normalize-string "^4.0.0-rc.2"
+    postcss-normalize-timing-functions "^4.0.0-rc.2"
+    postcss-normalize-unicode "^4.0.0-rc.2"
+    postcss-normalize-url "^4.0.0-rc.2"
+    postcss-normalize-whitespace "^4.0.0-rc.2"
+    postcss-ordered-values "^4.0.0-rc.2"
+    postcss-reduce-initial "^4.0.0-rc.2"
+    postcss-reduce-transforms "^4.0.0-rc.2"
+    postcss-svgo "^4.0.0-rc.2"
+    postcss-unique-selectors "^4.0.0-rc.2"
+
+cssnano-util-get-arguments@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano-util-get-arguments/-/cssnano-util-get-arguments-4.0.0-rc.2.tgz#39d5cf9caee9e9027066c37954655c14419c06d4"
+
+cssnano-util-get-match@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano-util-get-match/-/cssnano-util-get-match-4.0.0-rc.2.tgz#e48fad41c5d14875f7401fa7c87c5f0ae6d6ff9b"
+
+cssnano-util-raw-cache@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano-util-raw-cache/-/cssnano-util-raw-cache-4.0.0-rc.2.tgz#8b33cec7ba839bfc6a59a2c90fbd80dd404bef75"
+  dependencies:
+    postcss "^6.0.0"
+
+cssnano-util-same-parent@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano-util-same-parent/-/cssnano-util-same-parent-4.0.0-rc.2.tgz#b036b89f0d7c7516aafd1dc9e70f0ed05768834a"
+
+cssnano@4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-4.0.0-rc.2.tgz#bcc06fe303d4f0f14070e59c121667c1727e2feb"
+  dependencies:
+    cosmiconfig "^2.0.0"
+    cssnano-preset-default "^4.0.0-rc.2"
+    is-resolvable "^1.0.0"
+    postcss "^6.0.0"
 
 csso@~2.0.0:
   version "2.0.0"
@@ -2701,7 +2743,7 @@ domain-browser@~1.1.0:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/domain-browser/-/domain-browser-1.1.7.tgz#867aa4b093faa05f1de08c06f4d7b21fdf8698bc"
 
-dot-prop@^4.1.0:
+dot-prop@^4.1.0, dot-prop@^4.1.1:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-4.2.0.tgz#1f19e0c2e1aa0e32797c49799f2837ac6af69c57"
   dependencies:
@@ -2727,7 +2769,7 @@ ee-first@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/ee-first/-/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
 
-electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.17:
+electron-to-chromium@^1.3.17, electron-to-chromium@^1.3.18:
   version "1.3.18"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.18.tgz#3dcc99da3e6b665f6abbc71c28ad51a2cd731a9c"
 
@@ -3070,15 +3112,14 @@ ember-cli-path-utils@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/ember-cli-path-utils/-/ember-cli-path-utils-1.0.0.tgz#4e39af8b55301cddc5017739b77a804fba2071ed"
 
-ember-cli-postcss@3.5.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/ember-cli-postcss/-/ember-cli-postcss-3.5.0.tgz#e5bdfecf62a1c480999c0bcb7a786e97cf6eb4b8"
+ember-cli-postcss@3.5.1:
+  version "3.5.1"
+  resolved "https://registry.yarnpkg.com/ember-cli-postcss/-/ember-cli-postcss-3.5.1.tgz#3930541bbac81288b6749f86cbced09f351d3160"
   dependencies:
     bower "1.8.0"
     broccoli-merge-trees "2.0.0"
     broccoli-postcss "3.5.0"
     broccoli-postcss-single "1.4.0"
-    ember-cli-dependency-checker "2.0.1"
     merge "1.2.0"
 
 ember-cli-preprocess-registry@^3.1.0:
@@ -4463,6 +4504,10 @@ function-bind@^1.0.2:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.0.tgz#16176714c801798e4e8f2cf7f7529467bb4a5771"
 
+gather-stream@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/gather-stream/-/gather-stream-1.0.0.tgz#b33994af457a8115700d410f317733cbe7a0904b"
+
 gauge@~2.7.3:
   version "2.7.4"
   resolved "https://registry.yarnpkg.com/gauge/-/gauge-2.7.4.tgz#2c03405c7538c39d7eb37b317022e325fb018bf7"
@@ -4792,7 +4837,7 @@ has-unicode@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/has-unicode/-/has-unicode-2.0.1.tgz#e0e6fe6a28cf51138855e086d1691e771de2a8b9"
 
-has@^1.0.0, has@^1.0.1:
+has@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/has/-/has-1.0.1.tgz#8461733f538b0837c9361e39a9ab9e9704dc2f28"
   dependencies:
@@ -4859,6 +4904,10 @@ heimdalljs@^0.3.0:
   dependencies:
     rsvp "~3.2.1"
 
+hex-color-regex@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/hex-color-regex/-/hex-color-regex-1.1.0.tgz#4c06fccb4602fe2602b3c93df82d7e7dbf1a8a8e"
+
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
@@ -4899,6 +4948,14 @@ hosted-git-info@^2.1.4, hosted-git-info@^2.1.5:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.5.0.tgz#6d60e34b3abbc8313062c3b798ef8d901a07af3c"
 
+hsl-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/hsl-regex/-/hsl-regex-1.0.0.tgz#d49330c789ed819e276a4c0d272dffa30b18fe6e"
+
+hsla-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/hsla-regex/-/hsla-regex-1.0.0.tgz#c1ce7a3168c8c6614033a4b5f7877f3b225f9c38"
+
 html-comment-regex@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/html-comment-regex/-/html-comment-regex-1.1.1.tgz#668b93776eaae55ebde8f3ad464b307a4963625e"
@@ -5088,6 +5145,10 @@ is-arrayish@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
 
+is-arrayish@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.3.1.tgz#c2dfc386abaa0c3e33c48db3fe87059e69065efd"
+
 is-buffer@^1.1.0, is-buffer@^1.1.5:
   version "1.1.5"
   resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.5.tgz#1f3b26ef613b214b88cbca23cc6c01d87961eecc"
@@ -5098,6 +5159,21 @@ is-builtin-module@^1.0.0:
   dependencies:
     builtin-modules "^1.0.0"
 
+is-color-stop@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-color-stop/-/is-color-stop-1.1.0.tgz#cfff471aee4dd5c9e158598fbe12967b5cdad345"
+  dependencies:
+    css-color-names "^0.0.4"
+    hex-color-regex "^1.1.0"
+    hsl-regex "^1.0.0"
+    hsla-regex "^1.0.0"
+    rgb-regex "^1.0.1"
+    rgba-regex "^1.0.0"
+
+is-directory@^0.3.1:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/is-directory/-/is-directory-0.3.1.tgz#61339b6f2475fc772fd9c9d83f5c8575dc154ae1"
+
 is-dotfile@^1.0.0:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/is-dotfile/-/is-dotfile-1.0.3.tgz#a6a2f32ffd2dfb04f5ca25ecd0f6b83cf798a1e1"
@@ -5344,7 +5420,7 @@ js-yaml@3.6.1, js-yaml@~3.6.0:
     argparse "^1.0.7"
     esprima "^2.6.0"
 
-js-yaml@3.x, js-yaml@^3.2.5, js-yaml@^3.2.7, js-yaml@^3.5.1, js-yaml@^3.6.1:
+js-yaml@3.x, js-yaml@^3.2.5, js-yaml@^3.2.7, js-yaml@^3.4.3, js-yaml@^3.5.1, js-yaml@^3.6.1:
   version "3.9.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.9.1.tgz#08775cebdfdd359209f0d2acd383c8f86a6904a0"
   dependencies:
@@ -5809,10 +5885,6 @@ lru-cache@^4.0.1:
     pseudomap "^1.0.2"
     yallist "^2.1.2"
 
-macaddress@^0.2.8:
-  version "0.2.8"
-  resolved "https://registry.yarnpkg.com/macaddress/-/macaddress-0.2.8.tgz#5904dc537c39ec6dbefeae902327135fa8511f12"
-
 magic-string@^0.16.0:
   version "0.16.0"
   resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.16.0.tgz#970ebb0da7193301285fb1aa650f39bdd81eb45a"
@@ -5896,10 +5968,6 @@ matcher-collection@^1.0.0, matcher-collection@^1.0.1:
   dependencies:
     minimatch "^3.0.2"
 
-math-expression-evaluator@^1.2.14:
-  version "1.2.17"
-  resolved "https://registry.yarnpkg.com/math-expression-evaluator/-/math-expression-evaluator-1.2.17.tgz#de819fdbcd84dccd8fae59c6aeb79615b9d266ac"
-
 md5-hex@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/md5-hex/-/md5-hex-1.3.0.tgz#d2c4afe983c4370662179b8cad145219135046c4"
@@ -6052,7 +6120,7 @@ minimist@1.1.x:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.1.3.tgz#3bedfd91a92d39016fcfaa1c681e8faa1a1efda8"
 
-minimist@1.2.0, minimist@^1.1.0, minimist@^1.1.1, minimist@^1.1.3:
+minimist@1.2.0, minimist@^1.1.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
@@ -6232,7 +6300,7 @@ normalize-range@^0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/normalize-range/-/normalize-range-0.1.2.tgz#2d10c06bdfd312ea9777695a4d28439456b75942"
 
-normalize-url@^1.4.0:
+normalize-url@^1.0.0:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-1.9.1.tgz#2cc0d66b31ea23036458436e3620d85954c66c3c"
   dependencies:
@@ -6573,75 +6641,71 @@ portfinder@^1.0.7:
     debug "^2.2.0"
     mkdirp "0.5.x"
 
-postcss-calc@^5.2.0:
-  version "5.3.1"
-  resolved "https://registry.yarnpkg.com/postcss-calc/-/postcss-calc-5.3.1.tgz#77bae7ca928ad85716e2fda42f261bf7c1d65b5e"
+postcss-calc@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-calc/-/postcss-calc-6.0.0.tgz#b681b279c6d24fbe0e33ed9045803705445d613b"
   dependencies:
-    postcss "^5.0.2"
-    postcss-message-helpers "^2.0.0"
-    reduce-css-calc "^1.2.6"
+    css-unit-converter "^1.1.1"
+    postcss "^6.0.0"
+    postcss-selector-parser "^2.2.2"
+    reduce-css-calc "^2.0.0"
 
-postcss-color-function@3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/postcss-color-function/-/postcss-color-function-3.0.0.tgz#3c6fb60c6ff2240e541d49f2926edcad8700f3a6"
+postcss-color-function@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-function/-/postcss-color-function-4.0.0.tgz#7e0106f4f6a1ecb1ad5b3a8553ace5e828aae187"
   dependencies:
-    css-color-function "^1.2.0"
-    postcss "^5.0.4"
+    css-color-function "^1.3.0"
+    postcss "^6.0.1"
     postcss-message-helpers "^2.0.0"
     postcss-value-parser "^3.3.0"
 
-postcss-colormin@^2.1.8:
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/postcss-colormin/-/postcss-colormin-2.2.2.tgz#6631417d5f0e909a3d7ec26b24c8a8d1e4f96e4b"
+postcss-colormin@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-colormin/-/postcss-colormin-4.0.0-rc.2.tgz#978e17b77552cdde52e5e15503062b5cb7579272"
   dependencies:
-    colormin "^1.0.5"
-    postcss "^5.0.13"
-    postcss-value-parser "^3.2.3"
+    browserslist "^2.0.0"
+    color "^1.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-convert-values@^2.3.4:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/postcss-convert-values/-/postcss-convert-values-2.6.1.tgz#bbd8593c5c1fd2e3d1c322bb925dcae8dae4d62d"
+postcss-convert-values@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-convert-values/-/postcss-convert-values-4.0.0-rc.2.tgz#6255e099cfc064212ace00fa68bca74ecf6b4b7d"
   dependencies:
-    postcss "^5.0.11"
-    postcss-value-parser "^3.1.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-custom-properties@5.0.2:
-  version "5.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-5.0.2.tgz#9719d78f2da9cf9f53810aebc23d4656130aceb1"
+postcss-custom-properties@6.1.0:
+  version "6.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-6.1.0.tgz#9caf1151ac41b1e9e64d3a2ff9ece996ca18977d"
   dependencies:
-    balanced-match "^0.4.2"
-    postcss "^5.0.0"
+    balanced-match "^1.0.0"
+    postcss "^6.0.3"
 
-postcss-discard-comments@^2.0.4:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/postcss-discard-comments/-/postcss-discard-comments-2.0.4.tgz#befe89fafd5b3dace5ccce51b76b81514be00e3d"
+postcss-discard-comments@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-discard-comments/-/postcss-discard-comments-4.0.0-rc.2.tgz#9874d406414f554d017e1a1c8938d9b1ff0f2aa9"
   dependencies:
-    postcss "^5.0.14"
+    postcss "^6.0.0"
 
-postcss-discard-duplicates@^2.0.1:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-discard-duplicates/-/postcss-discard-duplicates-2.1.0.tgz#b9abf27b88ac188158a5eb12abcae20263b91932"
+postcss-discard-duplicates@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-discard-duplicates/-/postcss-discard-duplicates-4.0.0-rc.2.tgz#6218b98f65862dfc1dd35525ab954fc4bb78188d"
   dependencies:
-    postcss "^5.0.4"
+    postcss "^6.0.0"
 
-postcss-discard-empty@^2.0.1:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-discard-empty/-/postcss-discard-empty-2.1.0.tgz#d2b4bd9d5ced5ebd8dcade7640c7d7cd7f4f92b5"
+postcss-discard-empty@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-discard-empty/-/postcss-discard-empty-4.0.0-rc.2.tgz#3791106c7711d4468fe08bf0bf644a477788c880"
   dependencies:
-    postcss "^5.0.14"
+    postcss "^6.0.0"
 
-postcss-discard-overridden@^0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/postcss-discard-overridden/-/postcss-discard-overridden-0.1.1.tgz#8b1eaf554f686fb288cd874c55667b0aa3668d58"
+postcss-discard-overridden@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-discard-overridden/-/postcss-discard-overridden-4.0.0-rc.2.tgz#88507319a505afaa58acb93d3ef760270053388b"
   dependencies:
-    postcss "^5.0.16"
-
-postcss-discard-unused@^2.2.1:
-  version "2.2.3"
-  resolved "https://registry.yarnpkg.com/postcss-discard-unused/-/postcss-discard-unused-2.2.3.tgz#bce30b2cc591ffc634322b5fb3464b6d934f4433"
-  dependencies:
-    postcss "^5.0.14"
-    uniqs "^2.0.0"
+    postcss "^6.0.0"
 
 postcss-easy-import@2.1.0:
   version "2.1.0"
@@ -6656,13 +6720,6 @@ postcss-easy-import@2.1.0:
     postcss-import "^9.1.0"
     resolve "^1.1.7"
 
-postcss-filter-plugins@^2.0.0:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-filter-plugins/-/postcss-filter-plugins-2.0.2.tgz#6d85862534d735ac420e4a85806e1f5d4286d84c"
-  dependencies:
-    postcss "^5.0.4"
-    uniqid "^4.0.0"
-
 postcss-import@^9.1.0:
   version "9.1.0"
   resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-9.1.0.tgz#95fe9876a1e79af49fbdc3589f01fe5aa7cc1e80"
@@ -6674,111 +6731,162 @@ postcss-import@^9.1.0:
     read-cache "^1.0.0"
     resolve "^1.1.7"
 
-postcss-merge-idents@^2.1.5:
-  version "2.1.7"
-  resolved "https://registry.yarnpkg.com/postcss-merge-idents/-/postcss-merge-idents-2.1.7.tgz#4c5530313c08e1d5b3bbf3d2bbc747e278eea270"
+postcss-merge-longhand@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-4.0.0-rc.2.tgz#5aae5b86750d9a16e7bef6482dab65a9d4b3c03a"
   dependencies:
-    has "^1.0.1"
-    postcss "^5.0.10"
-    postcss-value-parser "^3.1.1"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+    stylehacks "^4.0.0-rc.2"
 
-postcss-merge-longhand@^2.0.1:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-2.0.2.tgz#23d90cd127b0a77994915332739034a1a4f3d658"
+postcss-merge-rules@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-merge-rules/-/postcss-merge-rules-4.0.0-rc.2.tgz#18d89d1a6ddcf91c7288775bfbefb881367ab944"
   dependencies:
-    postcss "^5.0.4"
-
-postcss-merge-rules@^2.0.3:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/postcss-merge-rules/-/postcss-merge-rules-2.1.2.tgz#d1df5dfaa7b1acc3be553f0e9e10e87c61b5f721"
-  dependencies:
-    browserslist "^1.5.2"
-    caniuse-api "^1.5.2"
-    postcss "^5.0.4"
-    postcss-selector-parser "^2.2.2"
+    browserslist "^2.0.0"
+    caniuse-api "^2.0.0"
+    cssnano-util-same-parent "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0-rc.0"
     vendors "^1.0.0"
 
 postcss-message-helpers@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/postcss-message-helpers/-/postcss-message-helpers-2.0.0.tgz#a4f2f4fab6e4fe002f0aed000478cdf52f9ba60e"
 
-postcss-minify-font-values@^1.0.2:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/postcss-minify-font-values/-/postcss-minify-font-values-1.0.5.tgz#4b58edb56641eba7c8474ab3526cafd7bbdecb69"
+postcss-minify-font-values@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-minify-font-values/-/postcss-minify-font-values-4.0.0-rc.2.tgz#e5fd79c97525e79421ea736d857baedce65a5ea9"
   dependencies:
-    object-assign "^4.0.1"
-    postcss "^5.0.4"
-    postcss-value-parser "^3.0.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-minify-gradients@^1.0.1:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/postcss-minify-gradients/-/postcss-minify-gradients-1.0.5.tgz#5dbda11373703f83cfb4a3ea3881d8d75ff5e6e1"
+postcss-minify-gradients@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-minify-gradients/-/postcss-minify-gradients-4.0.0-rc.2.tgz#c07e95a4f4f9f8a056e59ac0817e72e891bc62dc"
   dependencies:
-    postcss "^5.0.12"
-    postcss-value-parser "^3.3.0"
+    cssnano-util-get-arguments "^4.0.0-rc.2"
+    is-color-stop "^1.1.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-minify-params@^1.0.4:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/postcss-minify-params/-/postcss-minify-params-1.2.2.tgz#ad2ce071373b943b3d930a3fa59a358c28d6f1f3"
+postcss-minify-params@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-minify-params/-/postcss-minify-params-4.0.0-rc.2.tgz#4bd747f4ba7fd5b1f31ecc8823aa9a589e7f8980"
   dependencies:
-    alphanum-sort "^1.0.1"
-    postcss "^5.0.2"
-    postcss-value-parser "^3.0.2"
+    alphanum-sort "^1.0.0"
+    cssnano-util-get-arguments "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
     uniqs "^2.0.0"
 
-postcss-minify-selectors@^2.0.4:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/postcss-minify-selectors/-/postcss-minify-selectors-2.1.1.tgz#b2c6a98c0072cf91b932d1a496508114311735bf"
+postcss-minify-selectors@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-minify-selectors/-/postcss-minify-selectors-4.0.0-rc.2.tgz#86089c9d8a6a9166815f19bfa2d01b7da5d173f6"
   dependencies:
-    alphanum-sort "^1.0.2"
-    has "^1.0.1"
-    postcss "^5.0.14"
-    postcss-selector-parser "^2.0.0"
+    alphanum-sort "^1.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0-rc.0"
 
-postcss-normalize-charset@^1.1.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/postcss-normalize-charset/-/postcss-normalize-charset-1.1.1.tgz#ef9ee71212d7fe759c78ed162f61ed62b5cb93f1"
+postcss-normalize-charset@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-charset/-/postcss-normalize-charset-4.0.0-rc.2.tgz#898b67c77bea2ff7c318cf56b427bce10bc35db6"
   dependencies:
-    postcss "^5.0.5"
+    postcss "^6.0.0"
 
-postcss-normalize-url@^3.0.7:
-  version "3.0.8"
-  resolved "https://registry.yarnpkg.com/postcss-normalize-url/-/postcss-normalize-url-3.0.8.tgz#108f74b3f2fcdaf891a2ffa3ea4592279fc78222"
+postcss-normalize-display-values@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-display-values/-/postcss-normalize-display-values-4.0.0-rc.2.tgz#d802d77dc7fba66f72a201e94804029b24acd271"
+  dependencies:
+    cssnano-util-get-match "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-positions@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-positions/-/postcss-normalize-positions-4.0.0-rc.2.tgz#f12cb691438e8cb91abe914052ac2381e563da32"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0-rc.2"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-repeat-style@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-repeat-style/-/postcss-normalize-repeat-style-4.0.0-rc.2.tgz#c949358201116a20d01975c6e471611a5ddc9083"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0-rc.2"
+    cssnano-util-get-match "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-string@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-string/-/postcss-normalize-string-4.0.0-rc.2.tgz#924f2a98bf9b44d40591434acf8f31b71a977606"
+  dependencies:
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-timing-functions@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-timing-functions/-/postcss-normalize-timing-functions-4.0.0-rc.2.tgz#a03474b4ddc4a1278ec276557105cf552fa501f0"
+  dependencies:
+    cssnano-util-get-match "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-unicode@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-unicode/-/postcss-normalize-unicode-4.0.0-rc.2.tgz#953650b1449ec23da462fa45570435c43bed9dd6"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-url@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-url/-/postcss-normalize-url-4.0.0-rc.2.tgz#3ccad023b8e30ff434546a6e4b7baab1fa112c42"
   dependencies:
     is-absolute-url "^2.0.0"
-    normalize-url "^1.4.0"
-    postcss "^5.0.14"
-    postcss-value-parser "^3.2.3"
+    normalize-url "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-ordered-values@^2.1.0:
-  version "2.2.3"
-  resolved "https://registry.yarnpkg.com/postcss-ordered-values/-/postcss-ordered-values-2.2.3.tgz#eec6c2a67b6c412a8db2042e77fe8da43f95c11d"
+postcss-normalize-whitespace@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-whitespace/-/postcss-normalize-whitespace-4.0.0-rc.2.tgz#d8df79a51bab0003d009226be0cb1af87f308f43"
   dependencies:
-    postcss "^5.0.4"
-    postcss-value-parser "^3.0.1"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-reduce-idents@^2.2.2:
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/postcss-reduce-idents/-/postcss-reduce-idents-2.4.0.tgz#c2c6d20cc958284f6abfbe63f7609bf409059ad3"
+postcss-ordered-values@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-ordered-values/-/postcss-ordered-values-4.0.0-rc.2.tgz#7894a80b65be50c9361128087b48ea6e7a1db8bf"
   dependencies:
-    postcss "^5.0.4"
-    postcss-value-parser "^3.0.2"
+    cssnano-util-get-arguments "^4.0.0-rc.2"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-reduce-initial@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-reduce-initial/-/postcss-reduce-initial-1.0.1.tgz#68f80695f045d08263a879ad240df8dd64f644ea"
+postcss-reduce-initial@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-reduce-initial/-/postcss-reduce-initial-4.0.0-rc.2.tgz#ab2e1cca7903745a77b99630445c939152e0cd62"
   dependencies:
-    postcss "^5.0.4"
+    browserslist "^2.0.0"
+    caniuse-api "^2.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
 
-postcss-reduce-transforms@^1.0.3:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/postcss-reduce-transforms/-/postcss-reduce-transforms-1.0.4.tgz#ff76f4d8212437b31c298a42d2e1444025771ae1"
+postcss-reduce-transforms@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-reduce-transforms/-/postcss-reduce-transforms-4.0.0-rc.2.tgz#1c92610e9c595edd367a0988d64f59c371fe66d1"
   dependencies:
-    has "^1.0.1"
-    postcss "^5.0.8"
-    postcss-value-parser "^3.0.1"
+    cssnano-util-get-match "^4.0.0-rc.2"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
 
-postcss-selector-parser@^2.0.0, postcss-selector-parser@^2.2.2:
+postcss-selector-parser@^2.2.2:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-2.2.3.tgz#f9437788606c3c9acee16ffe8d8b16297f27bb90"
   dependencies:
@@ -6786,35 +6894,35 @@ postcss-selector-parser@^2.0.0, postcss-selector-parser@^2.2.2:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-svgo@^2.1.1:
-  version "2.1.6"
-  resolved "https://registry.yarnpkg.com/postcss-svgo/-/postcss-svgo-2.1.6.tgz#b6df18aa613b666e133f08adb5219c2684ac108d"
+postcss-selector-parser@^3.0.0-rc.0:
+  version "3.0.0-rc.0"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-3.0.0-rc.0.tgz#dfb74f1cf3bc043d5692e37203170ac2da40a150"
+  dependencies:
+    dot-prop "^4.1.1"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
+
+postcss-svgo@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-svgo/-/postcss-svgo-4.0.0-rc.2.tgz#c9a650e895bf6fcf517612d26331190ad696f30f"
   dependencies:
     is-svg "^2.0.0"
-    postcss "^5.0.14"
-    postcss-value-parser "^3.2.3"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
     svgo "^0.7.0"
 
-postcss-unique-selectors@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/postcss-unique-selectors/-/postcss-unique-selectors-2.0.2.tgz#981d57d29ddcb33e7b1dfe1fd43b8649f933ca1d"
+postcss-unique-selectors@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/postcss-unique-selectors/-/postcss-unique-selectors-4.0.0-rc.2.tgz#bb7773d522748bd87595248739ee045bed6f280b"
   dependencies:
-    alphanum-sort "^1.0.1"
-    postcss "^5.0.4"
+    alphanum-sort "^1.0.0"
+    postcss "^6.0.0"
     uniqs "^2.0.0"
 
-postcss-value-parser@^3.0.1, postcss-value-parser@^3.0.2, postcss-value-parser@^3.1.1, postcss-value-parser@^3.1.2, postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
+postcss-value-parser@^3.0.0, postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.0.tgz#87f38f9f18f774a4ab4c8a232f5c5ce8872a9d15"
 
-postcss-zindex@^2.0.1:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-zindex/-/postcss-zindex-2.2.0.tgz#d2109ddc055b91af67fc4cb3b025946639d2af22"
-  dependencies:
-    has "^1.0.1"
-    postcss "^5.0.4"
-    uniqs "^2.0.0"
-
 postcss@6.0.0:
   version "6.0.0"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.0.tgz#ef75a67e75fe2bfff53971045697202c018b2e81"
@@ -6831,7 +6939,7 @@ postcss@6.0.8, postcss@^6.0.6:
     source-map "^0.5.6"
     supports-color "^4.2.0"
 
-postcss@^5.0.0, postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12, postcss@^5.0.13, postcss@^5.0.14, postcss@^5.0.15, postcss@^5.0.16, postcss@^5.0.2, postcss@^5.0.4, postcss@^5.0.5, postcss@^5.0.8, postcss@^5.2.16:
+postcss@^5.0.14, postcss@^5.0.15:
   version "5.2.17"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.17.tgz#cf4f597b864d65c8a492b2eabe9d706c879c388b"
   dependencies:
@@ -6840,6 +6948,14 @@ postcss@^5.0.0, postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12, postcss@^5.0.
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
+postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.3:
+  version "6.0.9"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.9.tgz#54819766784a51c65b1ec4d54c2f93765438c35a"
+  dependencies:
+    chalk "^2.1.0"
+    source-map "^0.5.6"
+    supports-color "^4.2.1"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
@@ -7003,6 +7119,12 @@ read-cache@^1.0.0:
   dependencies:
     pify "^2.3.0"
 
+read-file-stdin@^0.2.0:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/read-file-stdin/-/read-file-stdin-0.2.1.tgz#25eccff3a153b6809afacb23ee15387db9e0ee61"
+  dependencies:
+    gather-stream "^1.0.0"
+
 read-only-stream@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/read-only-stream/-/read-only-stream-2.0.0.tgz#2724fd6a8113d73764ac288d4386270c1dbf17f0"
@@ -7110,19 +7232,12 @@ redeyed@~1.0.0:
   dependencies:
     esprima "~3.0.0"
 
-reduce-css-calc@^1.2.6:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/reduce-css-calc/-/reduce-css-calc-1.3.0.tgz#747c914e049614a4c9cfbba629871ad1d2927716"
+reduce-css-calc@^2.0.0:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/reduce-css-calc/-/reduce-css-calc-2.0.5.tgz#33c97838c5d4c711a5c14ef85ce4fde41483f7bd"
   dependencies:
-    balanced-match "^0.4.2"
-    math-expression-evaluator "^1.2.14"
-    reduce-function-call "^1.0.1"
-
-reduce-function-call@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/reduce-function-call/-/reduce-function-call-1.0.2.tgz#5a200bf92e0e37751752fe45b0ab330fd4b6be99"
-  dependencies:
-    balanced-match "^0.4.2"
+    css-unit-converter "^1.1.1"
+    postcss-value-parser "^3.3.0"
 
 regenerate@^1.2.1:
   version "1.3.2"
@@ -7270,6 +7385,10 @@ require-directory@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
 
+require-from-string@^1.1.0:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-1.2.1.tgz#529c9ccef27380adfec9a2f965b649bbee636418"
+
 require-main-filename@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-1.0.1.tgz#97f717b69d48784f5f526a6c5aa8ffdda055a4d1"
@@ -7317,10 +7436,18 @@ restore-cursor@^1.0.1:
     exit-hook "^1.0.0"
     onetime "^1.0.0"
 
+rgb-regex@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/rgb-regex/-/rgb-regex-1.0.1.tgz#c0e0d6882df0e23be254a475e8edd41915feaeb1"
+
 rgb@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/rgb/-/rgb-0.1.0.tgz#be27b291e8feffeac1bd99729721bfa40fc037b5"
 
+rgba-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/rgba-regex/-/rgba-regex-1.0.0.tgz#43374e2e2ca0968b0ef1523460b7d730ff22eeb3"
+
 right-align@^0.1.1:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/right-align/-/right-align-0.1.3.tgz#61339b722fe6a3515689210d24e14c96148613ef"
@@ -7569,6 +7696,12 @@ simple-is@~0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/simple-is/-/simple-is-0.2.0.tgz#2abb75aade39deb5cc815ce10e6191164850baf0"
 
+simple-swizzle@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
+  dependencies:
+    is-arrayish "^0.3.1"
+
 "simplemde@https://github.com/kevinansfield/simplemde-markdown-editor.git#ghost":
   version "1.11.2"
   resolved "https://github.com/kevinansfield/simplemde-markdown-editor.git#42971ea4d997f5bec519c1c68cf63bda6b278cb2"
@@ -7899,6 +8032,14 @@ styled_string@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/styled_string/-/styled_string-0.0.1.tgz#d22782bd81295459bc4f1df18c4bad8e94dd124a"
 
+stylehacks@^4.0.0-rc.2:
+  version "4.0.0-rc.2"
+  resolved "https://registry.yarnpkg.com/stylehacks/-/stylehacks-4.0.0-rc.2.tgz#6626611341fd09fcdf0d87042306483f22949a2f"
+  dependencies:
+    browserslist "^2.0.0"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0-rc.0"
+
 subarg@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/subarg/-/subarg-1.0.0.tgz#f62cf17581e996b48fc965699f54c06ae268b8d2"
@@ -7929,7 +8070,7 @@ supports-color@^3.1.0, supports-color@^3.2.3:
   dependencies:
     has-flag "^1.0.0"
 
-supports-color@^4.0.0, supports-color@^4.2.0:
+supports-color@^4.0.0, supports-color@^4.2.0, supports-color@^4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-4.2.1.tgz#65a4bb2631e90e02420dba5554c375a4754bb836"
   dependencies:
@@ -8090,6 +8231,10 @@ timers-browserify@^1.0.1:
   dependencies:
     process "~0.11.0"
 
+timsort@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/timsort/-/timsort-0.3.0.tgz#405411a8e7e6339fe64db9a234de11dc31e02bd4"
+
 tiny-lr@^1.0.3:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/tiny-lr/-/tiny-lr-1.0.5.tgz#21f40bf84ebd1f853056680375eef1670c334112"
@@ -8290,12 +8435,6 @@ uniq@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/uniq/-/uniq-1.0.1.tgz#b31c5ae8254844a3a8281541ce2b04b865a734ff"
 
-uniqid@^4.0.0:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/uniqid/-/uniqid-4.1.1.tgz#89220ddf6b751ae52b5f72484863528596bb84c1"
-  dependencies:
-    macaddress "^0.2.8"
-
 uniqs@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/uniqs/-/uniqs-2.0.0.tgz#ffede4b36b25290696e6e165d4a59edb998e6b02"
@@ -8542,6 +8681,10 @@ write-file-atomic@^2.0.0:
     imurmurhash "^0.1.4"
     slide "^1.1.5"
 
+write-file-stdout@0.0.2:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/write-file-stdout/-/write-file-stdout-0.0.2.tgz#c252d7c7c5b1b402897630e3453c7bfe690d9ca1"
+
 write@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/write/-/write-0.2.1.tgz#5fc03828e264cea3fe91455476f7a3c566cb0757"