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;
}

body.editor-is-fullscreen {
  overflow: hidden;
  .edit-area {
    z-index: 20;
  }
}

// Buttons
.editor-button {
  border: 1px solid #DDD;
  font-size: 12px;
  padding: 4px 6px;
  color: #444;
}
.editor-button:hover {
  background-color: #EEE;
  cursor: pointer;
  color: #000;
}
.editor-button[disabled] {
  pointer-events: none;
  cursor: not-allowed;
  background-color: #EEE;
  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;
  fill: #000;
}

// 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;
}
.editor-menu-list {
  display: flex;
  flex-direction: column;
}
.editor-menu-list > .editor-button {
  border-bottom: 0;
  text-align: start;
}

.editor-format-menu .editor-dropdown-menu {
  min-width: 320px;
}

.editor-overflow-container {
  display: flex;
}

.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);
  &: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: 1px solid #DDD;
  padding: 1rem;
  border-radius: 4px;
}
.editor-modal-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.editor-modal-title {
  font-weight: 700;
}

// 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 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;
}