discourse/app/assets/stylesheets/common/components/navs.css.scss

// --------------------------------------------------
// Navigation menus
// --------------------------------------------------

// Base
// --------------------------------------------------

%nav {
  margin-left: 0;
  list-style: none;
  > li > a {
    display: block;
    text-decoration: none;
  }
}

// Pill nav
// --------------------------------------------------

.nav-pills {
  @extend %nav;
  @extend .clearfix;
  > li {
    float: left;
    margin-right: 5px;
    > a {
      border: none;
      padding: 5px 12px;
      color: $nav-pills-color;
      font-size: 16px;
      line-height: 20px;
      &:hover {
        color: $nav-pills-color-hover;
        background-color: $nav-pills-background-color-hover;
      }
    }
    &.active > a, > a.active {
      border-color: darken($nav-pills-background-color-active, 10%);
      color: $tertiary_text_color;
      background-color: $nav-pills-background-color-active;
    }
  }
}

// Stacked nav
// --------------------------------------------------

.nav-stacked {
  position: relative;
  @extend %nav;
  border: 1px solid $nav-stacked-border-color;
  padding: 0;
  overflow: hidden;
  background-color: $nav-stacked-background-color;
  @include box-shadow(0 1px 0 $secondary_shadow_color);
  > li {
    border-bottom: 1px solid $nav-stacked-divider-color;
    &:last-of-type {
      border-bottom: 0;
    }
    > a {
      margin: 0;
      padding: 13px 13px 13px 30px;
      font-size: 16px;
      line-height: 20px;
      cursor: pointer;
      color: $nav-stacked-color;
    }
  }
  .active > a,
  .active .fa-chevron-right {
    color: $tertiary_text_color;
    background-color: $nav-stacked-background-color-active;
  }
  .count {
    font-size: 12px;
    line-height: 16px;
  }
  .fa-chevron-right {
    float: right;
    margin: 0;
    color: $nav-stacked-chevron-color;
    font-size: 14px;
    line-height: 20px;
  }

  .glyph {
    font-size: 12px;
    width: 30px;
    text-align: center;
    position: absolute;
    left: 2px;
    line-height: 20px;
  }
}