edx-platform/cms/static/sass/_header.scss

// header
.wrapper-header {
  margin: 0 0 ($baseline*1.5) 0;
  padding: $baseline;
  border-bottom: 1px solid tint($m-gray, 50%);
  @include box-shadow(0 1px 5px 0 rgba(0,0,0, 0.1));
  background: $white;
  height: 76px;
  position: relative;
  width: 100%;
  z-index: 10;

  a {
    color: $baseFontColor;
    display: block;

    &:hover, &:active {
      color: $blue;
    }
  }
}

.header {
  @include clearfix();
  max-width: 1280px;
  margin: 0 auto;
  color: $lightGrey;
}

.branding, .info-course, .nav-course, .nav-account {
  display: inline-block;
  vertical-align: top;
}

.branding, .info-course, .nav-course {
  margin: 0 ($baseline*0.75) 0 0;
}

.branding {
  position: relative;
  padding-right: 15px;

  a {
    @include text-hide();
    display: block;
    width: 164px;
    height: 32px;
    background: transparent url('../img/logo-edx-studio.png') 0 0 no-repeat;
  }

  &:before {
    @extend .faded-vertical-divider;
    content: "";
    display: block;
    height: 50px;
    position: absolute;
    right: 1px;
    top: -8px;
    width: 1px;
  }

  &:after {
    @extend .faded-vertical-divider-light;
    content: "";
    display: block;
    height: 50px;
    position: absolute;
    right: 0px;
    top: -12px;
    width: 1px;
  }
}

.info-course {
  position: relative;
  max-width: 200px;
  padding-right: 15px;
  font-size: 14px;

  &:before {
    @extend .faded-vertical-divider;
    content: "";
    display: block;
    height: 50px;
    position: absolute;
    right: 1px;
    top: -8px;
    width: 1px;
  }

  &:after {
    @extend .faded-vertical-divider-light;
    content: "";
    display: block;
    height: 50px;
    position: absolute;
    right: 0px;
    top: -12px;
    width: 1px;
  }

  .course-number, .course-title {
    display: block;
  }

  .course-number {
    font-size: 12px;
  }

  .course-title {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-size: 16px;
    font-weight: 600;

  }
}

.nav-course {
  width: 275px;
  margin-top: -($baseline/4);
  font-size: 14px;

  ol {
    @include clearfix();
  }

  .nav-item {
    display: inline-block;
    vertical-align: bottom;
    margin: 0 ($baseline/2) 0 0;

    &:last-child {
      margin-right: 0;
    }

    .title {
      display: block;
      padding: 5px;
      text-transform: uppercase;

      &:hover, &:active {
        color: $blue;
      }

      .label-prefix {
        display: block;
        font-size: 11px;
      }

      .ss-icon {
       
      }

      &.is-selected {
        color: $blue;
      }
    }

    // current state
    &.is-current {

      .title {
        color: $blue;
      }
    }

    // specific nav items
    &.nav-course-courseware {
    }

    &.nav-course-settings {
    }

    &.nav-course-tools {
    }
  }
}

.nav-account {
  float: right;
  max-width: 300px;
  min-width: 175px;
  width: 20%;
  margin-top: 10px;
  font-size: 14px;
  text-align: right;

  .nav-account-username {
    .ss-icon {
      display: inline-block;
      vertical-align: middle;
      margin-right: 3px;
      font-size: 12px;
    }

    .account-username {
      display: inline-block;
      width: 80%;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }
  }
}

// dropdown UI
.nav-dropdown {

  .nav-item {
    position: relative;
  }

  .nav-sub {
    @include border-radius(2px);
    position: absolute;
    top: 30px;
    width: 125px;
    border: 1px solid tint($m-gray, 50%);
    padding: ($baseline/4) ($baseline/2);
    @include box-shadow(0 1px 5px 0 rgba(0,0,0, 0.1));
    background: $white;

    li {
      margin: 0 0 ($baseline/4) 0;
      border-bottom: 1px solid tint($m-gray, 75%);
      padding: 0 0($baseline/4) 0;
      font-size: 13px;

      &:last-child {
        margin-bottom: 0;
        border-bottom: none;
        padding-bottom: 0;
      }

      a {
        display: block;
      }
    }

    // arrows
    &:after, &:before {

    }

    &:after {

    }

    &:before {

    }
  }

  // vendor
  .arrow_box {
    position: relative;
    background: #fff;
    border: 1px solid #a1a1a1;
  }
  .arrow_box:after, .arrow_box:before {
    bottom: 100%;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
  }

  .arrow_box:after {
    border-color: rgba(255, 255, 255, 0);
    border-bottom-color: #fff;
    border-width: 10px;
    left: 50%;
    margin-left: -10px;
  }
  .arrow_box:before {
    border-color: rgba(161, 161, 161, 0);
    border-bottom-color: #a1a1a1;
    border-width: 11px;
    left: 50%;
    margin-left: -11px;
  }

  // specific navs
  &.nav-account {

    .nav-sub {
      right: 0;
      text-align: left;
    }
  }

  &.nav-course {

    .nav-sub {
      left: -5px;
    }

    .nav-course-courseware {

      .nav-sub {
        top: 50px;
      }
    }

    .nav-course-settings {

      .nav-sub {
        top: 50px;
      }
    }

    .nav-course-tools {

      .nav-sub {
      
      }
    }
  }
}

// js enabled 
.js {

  .nav-dropdown {

    .nav-item .title {
      cursor: pointer;
    }
  }

  .nav-sub {
    @include transition (opacity 1.0s ease-in-out 0s);
    opacity: 0;
    pointer-events: none;

    &.is-shown {
      opacity: 1.0;
      pointer-events: auto;
    }
  }
}