diff --git a/ghost/core/core/frontend/src/cards/css/audio.css b/ghost/core/core/frontend/src/cards/css/audio.css
index 05df0afe14..b0793f5ffe 100644
--- a/ghost/core/core/frontend/src/cards/css/audio.css
+++ b/ghost/core/core/frontend/src/cards/css/audio.css
@@ -7,7 +7,8 @@
     display: flex;
     width: 100%;
     min-height: 96px;
-    border-radius: 3px;
+    border-radius: 6px;
+    padding: 4px;
     box-shadow: inset 0 0 0 1px rgba(124, 139, 154, 0.25);
 }
 
@@ -25,7 +26,7 @@
     background: transparent;
     object-fit: cover;
     aspect-ratio: 1/1;
-    border-radius: 2px;
+    border-radius: 3px;
 }
 
 .kg-audio-thumbnail.placeholder {
@@ -55,8 +56,8 @@
     padding: 8px 12px;
     border: none;
     font-family: inherit;
-    font-size: 1.15em;
-    font-weight: 700;
+    font-size: 16px;
+    font-weight: 600;
     line-height: 1.15em;
     background: transparent;
 }
@@ -72,9 +73,9 @@
     min-width: 38px;
     padding: 0 4px;
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 500;
-    line-height: 1.4em;
+    line-height: 1em;
     white-space: nowrap;
 }
 
@@ -82,9 +83,9 @@
     width: 56px;
     color: #ababab;
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 500;
-    line-height: 1.4em;
+    line-height: 1em;
     white-space: nowrap;
 }
 
@@ -127,9 +128,9 @@
     min-width: 37px;
     padding: 0 4px;
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 600;
-    line-height: 1.4em;
+    line-height: 1em;
     text-align: left;
     background: transparent;
     white-space: nowrap;
diff --git a/ghost/core/core/frontend/src/cards/css/bookmark.css b/ghost/core/core/frontend/src/cards/css/bookmark.css
index 818308f633..e14af83b01 100644
--- a/ghost/core/core/frontend/src/cards/css/bookmark.css
+++ b/ghost/core/core/frontend/src/cards/css/bookmark.css
@@ -13,7 +13,7 @@
 .kg-bookmark-card a.kg-bookmark-container:hover {
     display: flex;
     text-decoration: none;
-    border-radius: 3px;
+    border-radius: 6px;
     border: 1px solid rgb(124 139 154 / 25%);
     overflow: hidden;
     color: inherit;
@@ -31,14 +31,14 @@
 }
 
 .kg-bookmark-title {
-    font-size: 1.5rem;
+    font-size: 15px;
     line-height: 1.4em;
     font-weight: 600;
 }
 
 .kg-bookmark-description {
     display: -webkit-box;
-    font-size: 1.4rem;
+    font-size: 14px;
     line-height: 1.5em;
     margin-top: 3px;
     font-weight: 400;
@@ -54,7 +54,7 @@
     align-items: center;
     margin-top: 22px;
     width: 100%;
-    font-size: 1.4rem;
+    font-size: 14px;
     font-weight: 500;
     white-space: nowrap;
 }
diff --git a/ghost/core/core/frontend/src/cards/css/file.css b/ghost/core/core/frontend/src/cards/css/file.css
index 2ebbb1d815..165ba035c0 100644
--- a/ghost/core/core/frontend/src/cards/css/file.css
+++ b/ghost/core/core/frontend/src/cards/css/file.css
@@ -12,10 +12,10 @@
     align-items: stretch;
     justify-content: space-between;
     color: inherit;
-    padding: 6px;
+    padding: 12px;
     min-height: 92px;
     border: 1px solid rgb(124 139 154 / 25%);
-    border-radius: 3px;
+    border-radius: 5px;
     transition: all ease-in-out 0.35s;
     text-decoration: none;
     width: 100%;
@@ -34,26 +34,27 @@
 }
 
 .kg-file-card-title {
-    font-size: 1.15em;
-    font-weight: 700;
+    font-size: 16px;
+    font-weight: 600;
     line-height: 1.3em;
 }
 
 .kg-file-card-caption {
-    font-size: 0.95em;
+    font-size: 14px;
     line-height: 1.3em;
-    opacity: 0.6;
+    opacity: 0.7;
 }
 
 .kg-file-card-title + .kg-file-card-caption {
-    margin-top: -3px;
+    flex-grow: 1;
+    margin-top: 3px;
 }
 
 .kg-file-card-metadata {
     display: inline;
-    font-size: 0.825em;
+    font-size: 14px;
     line-height: 1.3em;
-    margin-top: 2px;
+    margin-top: 5px;
 }
 
 .kg-file-card-filename {
@@ -63,14 +64,15 @@
 
 .kg-file-card-filesize {
     display: inline-block;
-    font-size: 0.925em;
+    font-size: 14px;
     opacity: 0.6;
 }
 
 .kg-file-card-filesize:before {
     display: inline-block;
     content: "\2022";
-    margin-right: 4px;
+    margin-left: 6px;
+    margin-right: 6px;
 }
 
 .kg-file-card-icon {
@@ -81,6 +83,7 @@
     width: 80px;
     min-width: 80px;
     height: 100%;
+    min-height: 80px;
 }
 
 .kg-file-card-icon:before {
@@ -94,7 +97,7 @@
     background: currentColor;
     opacity: 0.06;
     transition: opacity ease-in-out 0.35s;
-    border-radius: 2px;
+    border-radius: 3px;
 }
 
 .kg-file-card a.kg-file-card-container:hover .kg-file-card-icon:before {
@@ -123,7 +126,7 @@
 }
 
 .kg-file-card-small .kg-file-card-metadata {
-    font-size: 1.0em;
+    font-size: 14px;
     margin-top: 0;
 }
 
diff --git a/ghost/core/core/frontend/src/cards/css/header_v2.css b/ghost/core/core/frontend/src/cards/css/header_v2.css
index 209f4b6ddf..ef5a9a1c7e 100644
--- a/ghost/core/core/frontend/src/cards/css/header_v2.css
+++ b/ghost/core/core/frontend/src/cards/css/header_v2.css
@@ -104,7 +104,7 @@
 
 .kg-content-wide .kg-header-card-content .kg-header-card-image {
     height: 100%;
-    padding: 8rem 0;
+    padding: 5.6em 0;
     object-fit: contain;
 }
 
@@ -112,22 +112,22 @@
 
 .kg-header-card h2.kg-header-card-heading {
     margin: 0;
-    font-size: clamp(2.4rem, 4vw, 3.6rem);
+    font-size: clamp(1.7em, 4vw, 2.5em);
     font-weight: 700;
-    line-height: 1em;
+    line-height: 1.05em;
     letter-spacing: -0.01em;
 }
 
 .kg-header-card.kg-width-wide h2.kg-header-card-heading {
-    font-size: clamp(2.4rem, 5vw, 4.8rem);
+    font-size: clamp(1.7em, 5vw, 3.3em);
 }
 
 .kg-header-card.kg-width-full h2.kg-header-card-heading {
-    font-size: clamp(2.8rem, 5.6vw, 6rem);
+    font-size: clamp(1.9em, 5.6vw, 4.2em);
 }
 
 .kg-header-card.kg-width-full.kg-layout-split h2.kg-header-card-heading {
-    font-size: clamp(2.8rem, 4vw, 4.8rem);
+    font-size: clamp(1.9em, 4vw, 3.3em);
 }
 
 /* Subheading */
@@ -139,7 +139,7 @@
 .kg-header-card .kg-header-card-subheading {
     max-width: 40em;
     margin: 0;
-    font-size: clamp(1.05em, 2vw, 2rem);
+    font-size: clamp(1.05em, 2vw, 1.4em);
     font-weight: 500;
     line-height: 1.2em;
 }
@@ -153,23 +153,24 @@
 }
 
 .kg-header-card.kg-width-wide .kg-header-card-subheading {
-    font-size: clamp(1.05em, 2vw, 2.2rem);
+    font-size: clamp(1.05em, 2vw, 1.55em);
 }
 
 .kg-header-card.kg-width-full .kg-header-card-subheading:not(.kg-layout-split .kg-header-card-subheading) {
     max-width: min(65vmax, 1200px);
-    font-size: clamp(1.05em, 2vw, 2.4rem);
+    font-size: clamp(1.05em, 2vw, 1.7em);
 }
 
 .kg-header-card.kg-width-full.kg-layout-split .kg-header-card-subheading {
-    font-size: clamp(1.05em, 2vw, 2.2rem);
+    font-size: clamp(1.05em, 2vw, 1.55em);
 }
 
 .kg-header-card.kg-v2 .kg-header-card-button {
     display: flex;
     position: relative;
     align-items: center;
-    height: 4.6rem;
+    height: 2.9em;
+    min-height: 46px;
     padding: 0 1.2em;
     outline: none;
     border: none;
@@ -243,15 +244,15 @@
     }
 
     .kg-content-wide .kg-header-card-content .kg-header-card-image {
-        padding: 2.4rem 0 0;
+        padding: 1.7em 0 0;
     }
 
     .kg-content-wide.kg-swapped .kg-header-card-content .kg-header-card-image {
-        padding: 0 0 2.4rem;
+        padding: 0 0 1.7em;
     }
 
     .kg-header-card.kg-v2 .kg-header-card-button {
-        height: 4.2rem;
+        height: 2.9em;
     }
 
     .kg-header-card.kg-v2.kg-width-wide .kg-header-card-button,
diff --git a/ghost/core/core/frontend/src/cards/css/product.css b/ghost/core/core/frontend/src/cards/css/product.css
index e7c480365f..4bfda77c16 100644
--- a/ghost/core/core/frontend/src/cards/css/product.css
+++ b/ghost/core/core/frontend/src/cards/css/product.css
@@ -36,8 +36,8 @@
 .kg-product-card h4.kg-product-card-title {
     font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
     text-decoration: none;
-    font-weight: 700;
-    font-size: 1.4em;
+    font-weight: 600;
+    font-size: 21px;
     margin-top: 0;
     margin-bottom: 0;
     line-height: 1.15em;
@@ -51,7 +51,7 @@
 .kg-product-card .kg-product-card-description ol,
 .kg-product-card .kg-product-card-description ul {
     font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
-    font-size: 0.95em;
+    font-size: 14px;
     line-height: 1.5em;
     opacity: .7;
     margin-bottom: 0;
@@ -94,7 +94,7 @@
 }
 
 .kg-product-card-rating-star {
-    height: 28px;
+    height: 20px;
     width: 20px;
 }
 
@@ -116,14 +116,14 @@
     position: static;
     align-items: center;
     font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
-    font-size: 0.95em;
+    font-size: 14px;
     font-weight: 600;
     line-height: 1em;
     text-decoration: none;
     width: 100%;
-    height: 2.4em;
-    border-radius: 5px;
-    padding: 0 1.2em;
+    height: 38px;
+    border-radius: 6px;
+    padding: 0 12px;
     transition: opacity 0.2s ease-in-out;
 }
 
diff --git a/ghost/core/core/frontend/src/cards/css/signup.css b/ghost/core/core/frontend/src/cards/css/signup.css
index 5817472a2d..264fa79d8b 100644
--- a/ghost/core/core/frontend/src/cards/css/signup.css
+++ b/ghost/core/core/frontend/src/cards/css/signup.css
@@ -97,7 +97,7 @@
 
 .kg-content-wide .kg-signup-card-content .kg-signup-card-image {
     height: 100%;
-    padding: 8rem 0;
+    padding: 5.6em 0;
     object-fit: contain;
 }
 
@@ -105,22 +105,22 @@
 
 .kg-signup-card h2.kg-signup-card-heading {
     margin: 0;
-    font-size: clamp(2.4rem, 4vw, 3.6rem);
+    font-size: clamp(1.7em, 4vw, 2.5em);
     font-weight: 700;
-    line-height: 1em;
+    line-height: 1.05em;
     letter-spacing: -0.01em;
 }
 
 .kg-signup-card.kg-width-wide h2.kg-signup-card-heading {
-    font-size: clamp(2.4rem, 5vw, 4.8rem);
+    font-size: clamp(1.7em, 5vw, 3.3em);
 }
 
 .kg-signup-card.kg-width-full h2.kg-signup-card-heading {
-    font-size: clamp(2.8rem, 5.6vw, 6rem);
+    font-size: clamp(1.9em, 5.6vw, 4.2em);
 }
 
 .kg-signup-card.kg-width-full.kg-layout-split h2.kg-signup-card-heading {
-    font-size: clamp(2.8rem, 4vw, 4.8rem);
+    font-size: clamp(1.9em, 4vw, 3.3em);
 }
 
 /* Subheading */
@@ -132,7 +132,7 @@
 .kg-signup-card .kg-signup-card-subheading {
     max-width: 40em;
     margin: 0;
-    font-size: clamp(1.05em, 2vw, 2rem);
+    font-size: clamp(1.05em, 2vw, 1.4em);
     font-weight: 500;
     line-height: 1.2em;
 }
@@ -146,16 +146,16 @@
 }
 
 .kg-signup-card.kg-width-wide .kg-signup-card-subheading {
-    font-size: clamp(1.05em, 2vw, 2.2rem);
+    font-size: clamp(1.05em, 2vw, 1.55em);
 }
 
 .kg-signup-card.kg-width-full .kg-signup-card-subheading:not(.kg-layout-split .kg-signup-card-subheading) {
     max-width: min(65vmax, 1200px);
-    font-size: clamp(1.05em, 2vw, 2.4rem);
+    font-size: clamp(1.05em, 2vw, 1.7em);
 }
 
 .kg-signup-card.kg-width-full.kg-layout-split .kg-signup-card-subheading {
-    font-size: clamp(1.05em, 2vw, 2.2rem);
+    font-size: clamp(1.05em, 2vw, 1.55em);
 }
 
 /* Subscribe form */
@@ -203,7 +203,8 @@
 
 .kg-signup-card-input {
     width: 100%;
-    height: 4.6rem;
+    height: 2.9em;
+    min-height: 46px;
     margin: 0 3px 0 0;
     padding: 12px 16px;
     border: none;
@@ -220,7 +221,8 @@
     display: flex;
     position: relative;
     align-items: center;
-    height: 4.6rem;
+    height: 2.9em;
+    min-height: 46px;
     padding: 0 1.2em;
     outline: none;
     border: none;
@@ -355,21 +357,21 @@
     }
 
     .kg-content-wide .kg-signup-card-content .kg-signup-card-image {
-        padding: 2.4rem 0 0;
+        padding: 1.7em 0 0;
     }
 
     .kg-content-wide.kg-swapped .kg-signup-card-content .kg-signup-card-image {
-        padding: 0 0 2.4rem;
+        padding: 0 0 1.7em;
     }
 
     .kg-signup-card-input {
-        height: 4.2rem;
+        height: 2.9em;
         padding: 6px 12px;
         font-size: 1em;
     }
 
     .kg-signup-card-button {
-        height: 4.2rem;
+        height: 2.9em;
     }
 
     .kg-signup-card.kg-width-wide .kg-signup-card-button,
diff --git a/ghost/core/core/frontend/src/cards/css/video.css b/ghost/core/core/frontend/src/cards/css/video.css
index 3d0247b9f1..e3ddd5c797 100644
--- a/ghost/core/core/frontend/src/cards/css/video.css
+++ b/ghost/core/core/frontend/src/cards/css/video.css
@@ -82,7 +82,7 @@
     padding: 0 4px;
     color: #fff;
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 500;
     line-height: 1.4em;
     white-space: nowrap;
@@ -91,7 +91,7 @@
 .kg-video-time {
     color: rgba(255, 255, 255, 0.6);
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 500;
     line-height: 1.4em;
     white-space: nowrap;
@@ -142,7 +142,7 @@
     padding: 0 4px;
     color: #fff;
     font-family: inherit;
-    font-size: .85em;
+    font-size: 12.5px;
     font-weight: 600;
     line-height: 1.4em;
     text-align: left;
diff --git a/ghost/core/test/e2e-api/admin/oembed.test.js b/ghost/core/test/e2e-api/admin/oembed.test.js
index 7f0b9920e5..dfeed17f11 100644
--- a/ghost/core/test/e2e-api/admin/oembed.test.js
+++ b/ghost/core/test/e2e-api/admin/oembed.test.js
@@ -221,6 +221,35 @@ describe('Oembed API', function () {
 
             should.exist(res.body.errors);
         });
+
+        it('should replace icon URL when it returns 404', async function () {
+            // Mock the page so it contains a readable icon URL
+            const pageMock = nock('http://example.com')
+                .get('/page-with-icon')
+                .reply(
+                    200,
+                    '<html><head><title>TESTING</title><link rel="icon" href="http://example.com/icon.svg"></head><body></body></html>',
+                    {'content-type': 'text/html'}
+                );
+
+            // Mock the icon URL to return 404
+            nock('http://example.com/')
+                .head('/icon.svg')
+                .reply(404);
+
+            const url = encodeURIComponent(' http://example.com/page-with-icon\t '); // Whitespaces are to make sure urls are trimmed
+            const res = await request.get(localUtils.API.getApiQuery(`oembed/?url=${url}&type=bookmark`))
+                .set('Origin', config.get('url'))
+                .expect('Content-Type', /json/)
+                .expect('Cache-Control', testUtils.cacheRules.private)
+                .expect(200);
+
+            // Check that the icon URL mock was loaded
+            pageMock.isDone().should.be.true();
+
+            // Check that the substitute icon URL is returned in place of the original
+            res.body.metadata.icon.should.eql('https://static.ghost.org/v5.0.0/images/link-icon.svg');
+        });
     });
 
     describe('with unknown provider', function () {
diff --git a/ghost/oembed-service/lib/OEmbedService.js b/ghost/oembed-service/lib/OEmbedService.js
index fedf30f5e2..738ff6895d 100644
--- a/ghost/oembed-service/lib/OEmbedService.js
+++ b/ghost/oembed-service/lib/OEmbedService.js
@@ -259,6 +259,15 @@ class OEmbedService {
             });
         }
 
+        if (metadata.icon) {
+            try {
+                await this.externalRequest.head(metadata.icon);
+            } catch (err) {
+                metadata.icon = 'https://static.ghost.org/v5.0.0/images/link-icon.svg';
+                logging.error(err);
+            }
+        }
+
         return {
             version: '1.0',
             type: 'bookmark',