android.moparisthebest.org/.themes/classic/sass/partials/sidebar/_base.scss

.side-shadow-border {
  @include box-shadow(lighten($sidebar-bg, 5) 0 1px);
}
aside[role=sidebar] {
  color: $sidebar-color;
  text-shadow: lighten($sidebar-bg, 8) 0 1px;
  section {
    @extend .sans;
    font-size: .8em;
    line-height: 1.4em;
    margin-bottom: 1.5em;
    h1 {
      margin: 1.5em 0 0;
      padding-bottom: .2em;
      border-bottom: 1px solid $sidebar-border;
      @extend .side-shadow-border;
      + p {
        padding-top: .4em;
      }
    }
  }
  ul {
    margin-bottom: 0.5em;
  }
  li {
    list-style: none;
    padding: .5em 0;
    margin: 0;
    border-bottom: 1px solid $sidebar-border;
    @extend .side-shadow-border;
    p:last-child {
      margin-bottom: 0;
    }
  }
  a {
    color: inherit;
    @include transition(color, .5s);
  }
  &:hover a {
    color: $sidebar-link-color;
    &:hover { color: $sidebar-link-color-hover; }
  }
}
.aside-alt-link {
  color: $sidebar-link-color-subdued;
  &:hover {
    color: $sidebar-link-color-subdued-hover;
  }
}