BookStack/resources/sass/_editor.scss

// Common variables
:root {
  --editor-color-primary: #206ea7;
}

// Main UI elements
.editor-container {
  background-color: #FFF;
  position: relative;
  &.fullscreen {
    z-index: 500;
  }
}
.editor-toolbar-main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  border-top: 1px solid #DDD;
  border-bottom: 1px solid #DDD;
}

body.editor-is-fullscreen {
  overflow: hidden;
  .edit-area {
    z-index: 20;
  }
}
.editor-content-area {
  &:focus {
    outline: 0;
  }
}
.editor-content-wrap {
  overflow-y: scroll;
}

// Buttons
.editor-button {
  font-size: 12px;
  padding: 4px;
  color: #444;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2px;
}
.editor-button:hover {
  background-color: #EEE;
  cursor: pointer;
  color: #000;
}
.editor-button[disabled] {
  pointer-events: none;
  cursor: not-allowed;
  opacity: .6;
}
.editor-button-active, .editor-button-active:hover {
  background-color: #ceebff;
  color: #000;
}
.editor-button-format-preview {
  padding: 4px 6px;
  display: block;
}
.editor-button-icon svg {
  width: 24px;
  height: 24px;
  color: inherit;
  fill: currentColor;
  display: block;
}

// Containers
.editor-dropdown-menu-container {
    position: relative;
}
.editor-dropdown-menu {
  position: absolute;
  background-color: #FFF;
  box-shadow: 0 0 6px 0 rgba(0, 0, 0, 0.15);
  z-index: 99;
  min-width: 120px;
  display: flex;
  flex-direction: row;
}
.editor-menu-list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.editor-menu-list .editor-button {
  border-bottom: 0;
  text-align: start;
  display: block;
  width: 100%;
}
.editor-menu-list > .editor-dropdown-menu-container .editor-dropdown-menu {
  inset-inline-start: 100%;
  top: 0;
  flex-direction: column;
}

.editor-format-menu-toggle {
  width: 130px;
  height: 32px;
  overflow: hidden;
  padding-inline: 12px;
  justify-content: start;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="%23666" d="M7.41 8L12 12.58 16.59 8 18 9.41l-6 6-6-6z"/></svg>');
  background-repeat: no-repeat;
  background-position: 98% 50%;
  background-size: 28px;
}
.editor-format-menu .editor-dropdown-menu {
  min-width: 300px;
  .editor-dropdown-menu {
    min-width: 220px;
  }
}
.editor-format-menu .editor-dropdown-menu .editor-dropdown-menu-container > .editor-button {
  padding: 8px 10px;
}

.editor-overflow-container {
  display: flex;
  border-inline: 1px solid #DDD;
  padding-inline: 4px;
  &:first-child {
    border-inline-start: none;
  }
  &:last-child {
    border-inline-end: none;
  }
  + .editor-overflow-container {
    border-inline-start: none;
  }
}

.editor-context-toolbar {
  position: fixed;
  background-color: #FFF;
  border: 1px solid #DDD;
  padding: .2rem;
  border-radius: 4px;
  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: row;
  &:before {
    content: '';
    z-index: -1;
    display: block;
    width: 8px;
    height: 8px;
    position: absolute;
    background-color: #FFF;
    border-top: 1px solid #DDD;
    border-left: 1px solid #DDD;
    transform: rotate(45deg);
    left: 50%;
    margin-left: -4px;
    top: -5px;
  }
}

// Modals
.editor-modal-wrapper {
  position: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  background-color: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
}
.editor-modal {
  background-color: #FFF;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 0 15px 0 rgba(0, 0, 0, 0.3);
}
.editor-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  background-color: var(--color-primary);
  color: #FFF;
}
.editor-modal-title {
  padding: 8px $-m;
}
.editor-modal-close {
  color: #FFF;
  padding: 8px $-m;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  &:hover {
  background-color: rgba(255, 255, 255, 0.1);
  }
  svg {
    width: 1rem;
    height: 1rem;
    fill: currentColor;
    display: block;
  }
}
.editor-modal-body {
  padding: $-m;
}

// Specific UI elements
.editor-color-select-row {
  display: flex;
}
.editor-color-select-option {
  width: 28px;
  height: 28px;
  cursor: pointer;
}
.editor-color-select-option:hover {
  border-radius: 3px;
  box-sizing: border-box;
  z-index: 3;
  box-shadow: 0 0 4px 1px rgba(0, 0, 0, 0.25);
}
.editor-table-creator-row {
  display: flex;
}
.editor-table-creator-cell {
  border: 1px solid #DDD;
  width: 15px;
  height: 15px;
  cursor: pointer;
  &.active {
    background-color: var(--editor-color-primary);
  }
}
.editor-table-creator-display {
  text-align: center;
  padding: 0.2em;
}

// In-editor elements
.editor-image-wrap {
  position: relative;
  display: inline-flex;
}
.editor-image-decorator {
  position: absolute;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  display: inline-block;
  &.selected {
    border: 1px dashed var(--editor-color-primary);
  }
}
.editor-image-decorator-handle {
  position: absolute;
  display: block;
  width: 10px;
  height: 10px;
  border: 2px solid var(--editor-color-primary);
  background-color: #FFF;
  user-select: none;
  &.nw {
    inset-inline-start: -5px;
    inset-block-start: -5px;
    cursor: nw-resize;
  }
  &.ne {
    inset-inline-end: -5px;
    inset-block-start: -5px;
    cursor: ne-resize;
  }
  &.se {
    inset-inline-end: -5px;
    inset-block-end: -5px;
    cursor: se-resize;
  }
  &.sw {
    inset-inline-start: -5px;
    inset-block-end: -5px;
    cursor: sw-resize;
  }
}

.editor-table-marker {
  position: fixed;
  background-color: var(--editor-color-primary);
  z-index: 99;
  user-select: none;
  opacity: 0;
  &:hover, &.active {
    opacity: 0.4;
  }
}
.editor-table-marker-column {
  width: 4px;
  cursor: col-resize;
}
.editor-table-marker-row {
  height: 4px;
  cursor: row-resize;
}

.editor-code-block-wrap {
  user-select: none;
  > * {
    pointer-events: none;
  }
}

// Editor form elements
.editor-form-field-wrapper {
  margin-bottom: .5rem;
}
.editor-form-field-input {
  display: block;
  width: 100%;
  min-width: 250px;
  border: 1px solid #DDD;
  padding: .5rem;
  border-radius: 4px;
  color: #444;
}
textarea.editor-form-field-input {
  font-family: var(--font-code);
  width: 350px;
  height: 250px;
  font-size: 12px;
}
.editor-form-field-label {
  color: #444;
  font-weight: 700;
  font-size: 12px;
}
.editor-form-actions {
  display: flex;
  justify-content: end;
  gap: $-s;
  margin-top: $-m;
}
.editor-form-actions > button {
  display: block;
  font-size: 0.85rem;
  line-height: 1.4em;
  padding: $-xs*1.3 $-m;
  font-weight: 400;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: none;
  &:focus {
    outline: 1px dotted currentColor;
    outline-offset: -$-xs;
    box-shadow: none;
    filter: brightness(90%);
  }
}
.editor-form-action-primary {
  background-color: var(--color-primary);
  color: #FFF;
  border: 1px solid var(--color-primary);
  &:hover {
    @include lightDark(box-shadow, $bs-light, $bs-dark);
    filter: brightness(110%);
  }
}
.editor-form-action-secondary {
  border: 1px solid;
  @include lightDark(border-color, #CCC, #666);
  @include lightDark(color, #666, #AAA);
  &:hover, &:focus, &:active {
    @include lightDark(color, #444, #BBB);
    border: 1px solid #CCC;
    box-shadow: 0 1px 4px 0 rgba(0, 0, 0, 0.1);
    background-color: #F2F2F2;
    @include lightDark(background-color, #f8f8f8, #444);
    filter: none;
  }
  &:active {
    border-color: #BBB;
    background-color: #DDD;
    color: #666;
    box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.1);
  }
}

// Editor theme styles
.editor-theme-bold {
  font-weight: bold;
}
.editor-theme-italic {
  font-style: italic;
}
.editor-theme-strikethrough {
  text-decoration-line: line-through;
}
.editor-theme-underline {
  text-decoration-line: underline;
}
.editor-theme-underline-strikethrough {
  text-decoration: underline line-through;
}