edx-platform/xmodule/css/annotatable/display.scss

/* TODO: move top-level variables to a common _variables.scss.
 * NOTE: These variables were only added here because when this was integrated with the CMS,
 * SASS compilation errors were triggered because the CMS didn't have the same variables defined
 * that the LMS did, so the quick fix was to localize the LMS variables not shared by the CMS.
 * -Abarrett and Vshnayder
 */
$annotatable--border-color: $gray-l3;
$annotatable--body-font-size: em(14);

.annotatable-wrapper {
  position: relative;
}

.annotatable-header {
  margin-bottom: 0.5em;
}

.annotatable-section {
  position: relative;
  padding: 0.5em 1em;
  border: 1px solid $annotatable--border-color;
  border-radius: 0.5em;
  margin-bottom: 0.5em;

  &.shaded { background-color: #ededed; }

  .annotatable-section-title {
    font-weight: bold;
    a { font-weight: normal; }
  }

  .annotatable-section-body {
    border-top: 1px solid $annotatable--border-color;
    margin-top: 0.5em;
    padding-top: 0.5em;

    @include clearfix();
  }

  ul.instructions-template {
    list-style: disc;
    margin-left: 4em;
    b { font-weight: bold; }
    i { font-style: italic; }

    code {
      display: inline;
      white-space: pre;
      font-family: Courier New, monospace;
    }
  }
}

.annotatable-toggle {
  position: absolute;
  right: 0;
  margin: 2px 1em 2px 0;
  &.expanded::after { content: " \2191"; }
  &.collapsed::after { content: " \2193"; }
}

.annotatable-span {
  @extend %ui-fake-link;

  display: inline;

  $highlight_index: 0;

  @each $highlight in (
    (yellow rgba(255, 255,10, 0.3) rgba(255, 255,10, 0.9)),
    (red rgba(178,19,16,0.3) rgba(178,19,16,0.9)),
    (orange rgba(255,165,0, 0.3) rgba(255,165,0, 0.9)),
    (green rgba(25,255,132,0.3) rgba(25,255,132,0.9)),
    (blue rgba(35,163,255,0.3) rgba(35,163,255,0.9)),
    (purple rgba(115,9,178,0.3) rgba(115,9,178,0.9))) {

    $highlight_index: $highlight_index + 1;
    $marker: nth($highlight, 1);
    $color: nth($highlight, 2);
    $selected_color: nth($highlight, 3);

    @if $highlight_index == 1 {
      &.highlight {
        background-color: $color;
        &.selected { background-color: $selected_color; }
      }
    }

    &.highlight-#{$marker} {
      background-color: $color;
      &.selected { background-color: $selected_color; }
    }
  }

  &.hide {
    cursor: none;
    background-color: inherit;

    .annotatable-icon {
      display: none;
    }
  }

  .annotatable-comment {
    display: none;
  }
}

.ui-tooltip.qtip.ui-tooltip {
  font-size: $annotatable--body-font-size;
  border: 1px solid #333;
  border-radius: 1em;
  background-color: rgba(0, 0, 0, 0.85);
  color: $white;
  -webkit-font-smoothing: antialiased;

  .ui-tooltip-titlebar {
    font-size: em(16);
    color: inherit;
    background-color: transparent;
    padding: ($baseline/4) ($baseline/2);
    border: none;

    .ui-tooltip-title {
      padding: ($baseline/4) 0;
      border-bottom: 2px solid #333;
      font-weight: bold;
    }

    .ui-tooltip-icon {
      right: 10px;
      background: #333;
    }

    .ui-state-hover {
      color: inherit;
      border: 1px solid $gray-l3;
    }
  }

  .ui-tooltip-content {
    color: inherit;
    font-size: em(14);
    text-align: left;
    font-weight: 400;
    padding: 0 ($baseline/2) ($baseline/2) ($baseline/2);
    background-color: transparent;
    border-color: transparent;
  }

  p {
    color: inherit;
    line-height: normal;
  }
}

.ui-tooltip.qtip.ui-tooltip-annotatable {
  max-width: 375px;

  .ui-tooltip-content {
    padding: 0 ($baseline/2);

    .annotatable-comment {
      display: block;
      margin: 0 0 ($baseline/2) 0;
      max-height: 225px;
      overflow: auto;
      line-height: normal;
    }

    .annotatable-reply {
      display: block;
      border-top: 2px solid #333;
      padding: ($baseline/4) 0;
      margin: 0;
      text-align: center;
    }
  }

  &::after {
    content: '';
    display: inline-block;
    position: absolute;
    bottom: -20px;
    left: 50%;
    height: 0;
    width: 0;
    margin-left: -($baseline/4);
    border: 10px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.85);
  }
}