overleaf/services/web/frontend/stylesheets/bootstrap-5/pages/editor/outline.scss

:root {
  --outline-bg-color: var(--bg-dark-secondary);
  --outline-border-color: var(--border-disabled-dark);
  --outline-header-hover-bg: var(--bg-dark-primary);
  --outline-item-hover-bg: var(--bg-dark-secondary);
  --outline-line-guide-color: var(--border-primary);
  --outline-container-color-bg: var(--bg-dark-tertiary);
  --outline-content-color: var(--content-primary-dark);
}

@include theme('light') {
  --outline-bg-color: var(--bg-light-primary);
  --outline-border-color: var(--border-disabled);
  --outline-item-hover-bg: var(--bg-light-tertiary);
  --outline-header-hover-bg: var(--bg-light-tertiary);
  --outline-line-guide-color: var(--border-disabled);
  --outline-container-color-bg: var(--bg-light-primary);
  --outline-content-color: var(--content-secondary);
}

.outline-container {
  width: 100%;
  height: 100%;
  background-color: var(--outline-container-color-bg);
}

.outline-pane {
  @include body-sm;

  display: flex;
  flex-flow: column;
  height: 100%;
  color: var(--content-primary-dark);
}

.outline-pane-disabled {
  opacity: 0.5;
}

.documentation-btn-container {
  @include toolbar-sm-height;

  background-color: var(--outline-bg-color);
  display: flex;
  align-items: center;
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 10%);

  & *,
  & :hover {
    color: var(--content-primary-dark);
    text-decoration: none;
  }

  &:hover {
    background-color: var(--bg-dark-primary);
  }
}

.documentation-close {
  padding: 0;
}

.outline-header {
  @include toolbar-sm-height;

  background-color: var(--outline-bg-color);
  display: flex;
  flex-shrink: 0;
  border-bottom: 1px solid var(--outline-border-color);
  border-top: 1px solid var(--outline-border-color);
}

.outline-header-expand-collapse-btn {
  color: var(--outline-content-color);
  display: flex;
  align-items: center;
  background-color: transparent;
  border: 0;
  padding: 0 var(--spacing-03) 0 0;
  font-size: inherit;
  vertical-align: inherit;
  flex: 1 0 100%;
  text-align: left;
  white-space: nowrap;
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 10%);

  &:hover,
  &:focus {
    outline: 0;
  }

  &:hover {
    background-color: var(--outline-header-hover-bg);
  }

  &:hover[disabled] {
    background-color: transparent;
  }
}

.outline-header-name {
  @include body-sm;

  color: var(--outline-content-color);
  display: inline-block;
  font-weight: 700;
  margin: 0;
  flex-grow: 1;
  flex-shrink: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.outline-body {
  background-color: var(--outline-container-color-bg);
  overflow-y: auto;
  padding-right: var(--spacing-03);
}

.outline-body-no-elements {
  color: var(--outline-content-color);
  text-align: center;
  padding: var(--spacing-08) var(--spacing-08) var(--spacing-11)
    var(--spacing-08);
  margin-right: calc(var(--spacing-03) * -1);
}

.outline-body-link {
  color: var(--outline-content-color);
  display: block;
  text-decoration: underline;

  &:hover,
  &:focus {
    color: var(--outline-content-color);
    text-decoration: underline;
  }
}

.outline-item-list {
  position: relative;
  list-style: none;
  padding-left: var(--spacing-08);

  &::before {
    content: '';
    background-color: var(--outline-line-guide-color);
    top: var(--spacing-03);
    bottom: var(--spacing-03);
    width: 1px;
    left: var(--spacing-10);
    position: absolute;
  }

  &.outline-item-list-root {
    padding-left: 0;

    &::before {
      left: var(--spacing-05);
    }
  }
}

.outline-item-no-children {
  padding-left: var(--spacing-07);
}

.outline-item-row {
  display: flex;
  overflow: hidden;
  white-space: nowrap;
}

.outline-item-expand-collapse-btn {
  background-color: var(--outline-container-color-bg);
  display: inline;
  border: 0;
  padding: 0;
  font-size: inherit;
  vertical-align: inherit;
  position: relative;
  z-index: 1;
  color: var(--content-disabled);
  margin-right: calc(var(--spacing-03) * -1);
  border-radius: var(--border-radius-base);

  &:hover,
  &:focus {
    outline: 0;
  }

  &:hover {
    background-color: var(--outline-item-hover-bg);
  }
}

.outline-item-link {
  @include text-truncate;

  color: var(--outline-content-color);
  display: inline;
  background-color: transparent;
  border: 0;
  position: relative;
  z-index: 1;
  padding: 0 var(--spacing-03);
  line-height: var(--spacing-08);
  border-radius: var(--border-radius-base);
  text-align: left;

  &:hover,
  &:focus {
    background-color: var(--outline-item-hover-bg);
    outline: 0;
  }
}

.outline-item-link-highlight {
  background-color: tint($bg-dark-tertiary, 15%);
}

.outline-caret-icon {
  width: var(--spacing-08);
  font-size: 17px;
  text-align: center;
}