ensl.org/app/assets/stylesheets/layout/_header.scss

nav.top {
  $navigation-background: $dark-gray;
  $navigation-color: transparentize(white, 0.3);
  $navigation-color-hover: white;
  $navigation-height: 40px;

  background-color: $navigation-background;
  border-bottom: 1px solid darken($navigation-background, 10);
  font-family: $monserrat;
  height: $navigation-height;
  width: 100%;
  z-index: 999;

  .menu-wrapper {
    @include outer-container;
    @extend %container-padded;
    position: relative;
    z-index: 9999;
  }

  .navigation-menu-button {
    color: $navigation-color;
    cursor: pointer;
    display: block;
    float: right;
    font-family: $monserrat;
    font-weight: 700;
    line-height: $navigation-height;
    margin: 0;
    padding-right: 1em;
    text-transform: uppercase;

    @include media ($large-screen) {
      display: none;
    }

    &:hover {
      color: $navigation-color-hover;
    }
  }

  .nav {
    @include media ($large-screen) {
      float: left;
    }
  }

  #navigation-menu {
    @include span-columns(12);

    .gathers {
      @include span-columns(6);
    }

    .pages {
      @include span-columns(6);
      @include omega;

      text-align: right;

      li:last-child {
        padding-right: 0;
      }
    }
  }

  #navigation-menu ul {
    -webkit-transform-style: preserve-3d; // stop webkit flicker
    display: none;
    margin: 0 auto;
    overflow: hidden;
    padding: 0;
    width: 100%;
    z-index: 9999;

    @include media ($large-screen) {
      display: inline-block;
      margin: 0;
      padding: 0;
    }
  }

  ul li {
    background: $navigation-background;
    display: block;
    line-height: $navigation-height;
    overflow: hidden;
    padding-right: .8em;
    text-align: right;
    width: 100%;
    z-index: 9999;

    @include media ($large-screen) {
      background: transparent;
      display: inline;
      line-height: $navigation-height;
      padding-right: 2em;
      text-decoration: none;
      width: auto;
    }

    a {
      font-weight: 400;
      color: $navigation-color;

      &:hover {
        color: $navigation-color-hover;
      }
    }
  }
}

header .banner {
  #logo {
    @include span-columns(8);
    min-height: 200px;
    position: relative;
    img {
      width: 430px;
      height: 200px;
      position: absolute;
      top: 5px;
      left: 0;
      z-index: 1;
    }
  }

  #authentication {
    @include span-columns(4); 
  }
}