compass/doc-src/content/stylesheets/partials/_nav.scss

.triangle-marker {
  border-color: transparent transparent;
  content: "\00a0";
  height: 0; width: 0;
  position: absolute;
  border-style: solid; }
  
nav a { @include hover-link; }
nav .selected a:hover { text-decoration: none;}

header { @extend .group;
  font-size: 1.25em; font-family: "Museo Sans"; border-width: 4px;}
#main-nav {
  width: 79%;
  display: inline-block;
  padding-bottom: 10px;
  ul {
    @include horizontal-list(10px);
    line-height: 2em; }}

#sub-nav {
  @extend .group;
  padding: 8px 0; }
  
#docs-nav, #module-nav {
  display: inline-block;
  float: left;
  a {
    padding: 2px 10px;
    display: inline-block; }}
    
#docs-nav { padding-right: 20px; }
    
#module-nav {
  display: inline-block;
  padding-left: 10px;
  ul { @include horizontal-list(false); }}

#module-nav li.selected { position: relative;
  a:before{ @extend .triangle-marker;
    border-width: 0 8px 8px;
    z-index: 2;
    bottom: -9px;
    left: 50%;
    margin-left: -8px;
    border-bottom-color: #121212;
  }
  &:before { @extend .triangle-marker;
    border-bottom-color: #414141;
    border-width: 0 6px 6px;
    z-index: 3;
    bottom: -9px;
    left: 50%;
    margin-left: -6px;
  }
  &:after { @extend .triangle-marker;
    border-bottom-color: #343434;
    border-width: 0 5px 5px;
    z-index: 3;
    bottom: -10px;
    left: 50%;
    margin-left: -5px;
  }
}
    
#search-docs {
  position: absolute; top: 29px; right: 0;
  &:before {
    content: "s";
    display: block;
    @extend .pictos;
    position: absolute;
    left: 6px;
    top: 4px;
    font-size: .8em;
    z-index: 20;
    @include opacity(.8)
  }
  input { @extend .sans-font; @include round-corners;
    @include box-sizing(border-box);
    max-width: 200px; min-width: 75px; border: 0; margin: 0; padding: 5px 8px 5px 23px;
    font-size: .8em;
    float: right;
    position: relative; } }