ensl.org/app/assets/stylesheets/components/_tabs.scss

/*
  Tabs
*/

.tabbed {
  $tabs-border-width: em(1);
  $tabs-border-colour: darken($light-gray, 10);
  $tabs-padding-vertical: em(8);
  $tabs-padding-horizontal: em(16);

  ul.tabs {
    @include span-columns(12);
    display: block;
    font-family: $montserrat;
    height: em(40);
    max-height: em(40);
    position: relative;

    li {
      float: left;
      display: block;
      background-color: $light-blue;

      a {
        border: $tabs-border-width solid $tabs-border-colour;
        border-right: 0;
        padding: $tabs-padding-vertical $tabs-padding-horizontal;
        float: left;
        display: block;
        color: white;
      }

      &:last-child a {
        border-right: $tabs-border-width solid $tabs-border-colour;
      }

      &.activeli {
        z-index: 100;
        background-color: $blue;

        a {
          padding-bottom: $tabs-padding-vertical + $tabs-border-width;
          border-bottom: 0;
        }
      }
    }
  }

  .tabbed-contents {
    @include span-columns(12);  
    border: $tabs-border-width solid $tabs-border-colour;
    padding: em(20);
  }

  @for $i from 1 through $grid-columns {
    ul.tabs-#{$i} {
      li {
        @include span-columns($i);
      }
    }
  }
}