Ghost/ghost/admin/app/styles/components/koenig.css

/* TODO: move these back into the editor.css layout? */

/* scrollable container */
.gh-koenig-editor {
    position: relative;
    z-index: 0;
    width: 100%;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
}

/* padded container housing title + editor canvas, scrollable content */
.gh-koenig-editor-pane {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: 10vw 4vw;
}

@media (max-width: 500px) {
    .gh-koenig-editor-pane {
        padding: 15vw 4vw;
    }
}

/* use flex-grow to fill the available vertical space so clicks outside the
   editor content can trigger focus */
.gh-koenig-editor-pane .koenig-editor {
    width: 100%;
    flex-grow: 1;
    cursor: text;
}

/* NOTE: everything from this point should be Koenig addon specific */

/* Editor canvas layout ----------------------------------------------------- */

.koenig-editor {
    position: relative; /* necessary to position toolbar etc */
    max-width: 760px;
    margin: 0 auto;
}

/* Formatting Toolbar ------------------------------------------------------- */

.koenig-toolbar {
    position: absolute;
    display: flex;
    align-items: center;
    text-align: center;
    user-select: none;
    cursor: pointer;
    color: color(var(--lightgrey) l(-10%));
    background: linear-gradient(
        color(var(--darkgrey) l(-3%)),
        color(var(--darkgrey) l(-8%))
    );
    border-radius: 5px;
    box-shadow: 0 0 0 1px color(var(--darkgrey) l(-10%)), 0 8px 16px rgba(26,39,49,0.16), rgba(255,255,255,0.09) 0 1px 0 0 inset;
    z-index:110; /* places it above the title */
    pointer-events: none !important; /* no interactivity when hidden */
    opacity: 0;
    transition-property: opacity;
    transition-duration: 300ms;
}

.koenig-toolbar--visible {
    pointer-events: auto !important; /* make sure the buttons work */
    opacity: 1;
}

.koenig-toolbar:after {
    display: block;
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    margin-left: -10px;
    width: 0;
    height: 0;
    border-left: transparent 10px solid;
    border-right: transparent 10px solid;
    border-top: color(var(--darkgrey) l(-10%)) 8px solid;
    transition-property: left;
    transition-duration: 100ms;
}
.koenig-toolbar.tick-above:after {
    border: none;
}

.koenig-toolbar.is-link {
    width: 263px;
    height: 40px;
}
.koenig-toolbar.is-link input {
    width: 100%;
    background-color: transparent;
    outline: none;
    border: none;
    padding:5px;
}
.koenig-toolbar.is-touch {
    position: fixed !important;
    top: 70px;
    right: 40px;
}

.koenig-toolbar.is-touch:after {
    border: none;
}

.koenig-toolbar-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 40px;
    width: 32px;
    font-size: 1.6rem;
    line-height: 40px;
    transition: text-shadow 0.3s ease;
}

.koenig-toolbar-btn:first-child {
    width: 43px;
    padding-left: 8px;
}
.koenig-toolbar-btn:last-child {
    width: 43px;
    padding-right: 8px;
}

.koenig-toolbar-btn svg {
    height: 1.4rem;
}

.koenig-toolbar-btn svg g {
    stroke-width: 2px;
    stroke: color(var(--lightgrey) l(-10%));
}

.koenig-toolbar-btn:hover,
.koenig-toolbar-btn.selected {
    color: #fff;
    cursor: pointer;
    text-shadow: #000 0 1px 6px;
}

.koenig-toolbar-btn:hover svg g {
    stroke: #fff;
}

.koenig-toolbar-btn-bold {
    font-weight: 700;
}

.koenig-toolbar-btn-italic {
    width: 31px;
    font-size: 1.7rem;
    text-indent: -1px;
    font-style: italic;
    font-family: Georgia, Times, serif;
    font-weight: 500;
}

.koenig-toolbar-btn-strike {
    text-decoration: line-through;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

.koenig-toolbar-btn-h1 {
    font-variant: small-caps;
    font-weight: 700;
    -webkit-font-smoothing: antialiased;
}

.koenig-toolbar-btn-h2 {
    font-weight: 700;
    font-size: 0.9em;
    font-variant: small-caps;
    line-height: 42px;
    -webkit-font-smoothing: antialiased;
}

.koenig-toolbar-btn-quote {
    font-size: 4rem;
    line-height: 62px;
    font-family: Georgia, Times, serif;
    -webkit-font-smoothing: antialiased;
}

.koenig-toolbar-divider {
    height: 40px;
    width: 1px;
    margin: 0 9px 0 8px;
    background: color(var(--darkgrey) l(-10%));
    box-shadow: rgba(255,255,255,0.04) 1px 0 0 0;
}

/* ⨁ menu ------------------------------------------------------------------ */

/* Slash shortcut menu ------------------------------------------------------ */

/* Menu items --------------------------------------------------------------- */

/* mobiledoc-kit base styles ------------------------------------------------
 * NOTE: adapted from https://github.com/bustle/mobiledoc-kit/blob/master/src/css/mobiledoc-kit.css
 */

/**
 * Editor
 */

/* TODO: update to match Ghost styles */
.__mobiledoc-editor {
    position: relative;
    font-family: var(--font-family);
    font-size: 1.7rem;
    resize: none;
    font-weight: 200;
    letter-spacing: 0.1px;
    min-height: 1em;
}

.__mobiledoc-editor:focus {
    outline: none;
}

.__mobiledoc-editor > * {
    position: relative;
}

.__mobiledoc-editor.__has-no-content:after {
    content: attr(data-placeholder);
    color: #bbb;
    cursor: text;
    position: absolute;
    top: 0;
}

.__mobiledoc-editor a {
    color: #0b8bff;
    white-space: nowrap;
}

/* override of global.css block display */
.__mobiledoc-editor i {
    display: inline;
}

.__mobiledoc-editor h1,
.__mobiledoc-editor h2,
.__mobiledoc-editor h3,
.__mobiledoc-editor h4,
.__mobiledoc-editor h5,
.__mobiledoc-editor h6 {
    font-weight: 800;
    letter-spacing: -0.02em;
}

.__mobiledoc-editor blockquote {
    border-left: 4px solid #0b8bff;
    margin: 1em 0 1em -1.2em;
    padding-left: 1.05em;
    color: #a0a0a0;
}

.__mobiledoc-editor img {
    display: block;
    max-width: 100%;
    margin: 0 auto;
}

.__mobiledoc-editor div,
.__mobiledoc-editor iframe {
    max-width: 100%;
}

/**
 * Cards
 */

.__mobiledoc-card {
    display: inline-block;
}

/**
 * Tooltips
 */

@-webkit-keyframes fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}
@keyframes fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.__mobiledoc-tooltip {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 0.7em;
    white-space: nowrap;
    position: absolute;
    background-color: rgba(43,43,43,0.9);
    border-radius: 3px;
    line-height: 1em;
    padding: 0.7em 0.9em;
    color: #FFF;
    -webkit-animation: fade-in 0.2s;
            animation: fade-in 0.2s;
}

.__mobiledoc-tooltip:before {
    content: '';
    position: absolute;
    left: 50%;
    width: 0;
    height: 0;
    border-left: 0.4em solid transparent;
    border-right: 0.4em solid transparent;
    border-bottom: 0.4em solid rgba(43,43,43,0.9);
    top: -0.4em;
    margin-left: -0.4em;
}

/* help keeps mouseover state when moving from link to tooltip */
.__mobiledoc-tooltip:after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: -0.4em;
    height: 0.4em;
}

.__mobiledoc-tooltip a {
    color: #FFF;
    text-decoration: none;
}

.__mobiledoc-tooltip a:hover {
    text-decoration: underline;
}