edx-platform/lms/static/sass/_shared_header.scss

header.app {
  border-bottom: 1px solid rgb(200,200,200);
  @include background-image(linear-gradient(-90deg, rgb(245,245,245), rgb(230,230,230)));
  height: 55px;
  width: 100%;

  .wrapper {
    @include clearfix;
    @include box-sizing(border-box);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0px 10px;
    width: flex-grid(12);
  }

  a.logo {
    @include box-sizing(border-box);
    display: block;
    float: left;
    height: 100%;
    margin: 16px 30px 0px 0px;
    position: relative;

    &::after {
      @extend .faded-vertical-divider;
      content: "";
      display: block;
      height: 50px;
      position: absolute;
      right: -15px;
      top: -12px;
    }
  }

  a.discover-courses {
    @include background-image(linear-gradient(-90deg, rgb(245,245,245) 0%, rgb(243,243,243) 50%, rgb(237,237,237) 50%, rgb(235,235,235) 100%));
    border: 1px solid rgb(200,200,200);
    @include border-radius(3px);
    @include box-shadow(0 1px 0 0 rgba(255,255,255, 0.6));
    color: $base-font-color;
    display: block;
    float: left;
    font: normal 1rem/1.2rem $sans-serif;
    height: 15px;
    margin-top: 12px;
    padding: 8px 10px;
    text-decoration: none;
    text-transform: uppercase;
    text-shadow: 0 1px rgba(255,255,255, 0.6);

    &:hover {
    }
  }

  nav.guest {
    float: right;

    ol {
      font-size: 0em;

      li {
        @include inline-block;
        margin-top: 12px;
        padding: 0px 5px;
        position: relative;
        vertical-align: bottom;

        &:last-child {
          padding-right: 0px;
        }

        a {
          @include border-radius(3px);
          border: 1px solid transparent;
          color: $base-font-color;
          display: block;
          font: normal italic 1.2rem/1.2rem $serif;
          height: 15px;
          padding: 8px;
          text-decoration: none;
          text-transform: lowercase;
          text-shadow: 0 1px rgba(255,255,255, 0.6);

          &:hover {
            background: rgb(220,220,220);
            @include background-image(linear-gradient(-90deg, rgb(245,245,245) 0%, rgb(243,243,243) 50%, rgb(237,237,237) 50%, rgb(235,235,235) 100%));
            border-color: rgb(200,200,200);
            @include box-shadow(0 1px 0 0 rgba(255,255,255, 0.6));
            color: $base-font-color;
          }
        }
      }
    }
  }

  nav.user {
    float: right;

    ol {
      font-size: 0em;

      li {
        border-right: 1px solid rgb(200,200,200);
        @include inline-block;
        margin-top: 10px;
        padding: 0px 5px;
        position: relative;
        vertical-align: bottom;

        a {
          @include border-radius(3px);
          color: $lighter-base-font-color;
          display: block;
          font: normal italic 1.2rem/1.2rem $serif;
          height: 15px;
          padding: 10px;
          text-decoration: none;
          text-transform: lowercase;
          text-shadow: 0 1px rgba(255,255,255, 0.4);

          &:hover {
            background: rgb(220,220,220);
            color: $base-font-color;
          }

          &.active {
            background: rgb(220,220,220);
            color: $base-font-color;
          }

          &.options {
            font: normal 1.2rem/1.2rem $sans-serif;
            padding-right: 10px;
            text-transform: none;
          }

          &.user-link {
            font: normal 1.2rem/1.2rem $sans-serif;
            padding: 10px 10px 10px 45px;
            text-transform: none;

            @media screen and (max-width: 768px) {
              font-size: 0em;
              padding: 10px 0px;
              width: 38px;
            }

            .avatar {
              background: rgb(220,220,220);
              @include border-radius(3px);
              border: 1px solid rgb(180,180,180);
              @include box-shadow(0 1px 0 0 rgba(255,255,255, 0.6));
              height: 22px;
              @include inline-block;
              left: 15px;
              overflow: hidden;
              position: absolute;
              top: 5px;
              width: 22px;

              &::after {
                @include background-image(linear-gradient((-60deg), rgba(0,0,0, 0) 0%, rgba(0,0,0, 0.1) 50%, rgba(0,0,0, 0.2) 50%, rgba(0,0,0, 0.3) 100%));
                content: "";
                display: block;
                height: 100%;
                position: absolute;
                right: 0px;
                top: 0px;
                width: 100%;
              }

              img {
                @include border-radius(4px);
                display: block;
                min-height: 100%;
                min-width: 100%;
                height: 100%;
              }
            }
          }
        }

        ol.user-options {
          @include border-radius(4px);
          @include box-shadow(0 1px 6px 0 rgba(0,0,0, 0.3));
          border: 1px solid rgb(200,200,200);
          background: rgb(220,220,220);
          display: none;
          right: 4px;
          padding: 5px 10px;
          position: absolute;
          top: 50px;
          width: 170px;
          z-index: 3;

          &.expanded {
            display: block;
          }

          &::before {
            background: transparent;
            border: {
              top: 8px solid rgb(220,220,220);
              right: 8px solid rgb(220,220,220);
              bottom: 8px solid transparent;
              left: 8px solid transparent;
            }
            @include box-shadow(1px 0 0 0 rgb(200,200,200), 0 -1px 0 0 rgb(200,200,200));
            content: "";
            display: block;
            height: 0px;
            position: absolute;
            @include transform(rotate(-45deg));
            right: 10px;
            top: -7px;
            width: 0px;
          }

          li {
            border: {
              top: 1px solid rgb(200,200,200);
              right: none;
              bottom: none;
              left: none;
            }
            margin: 0px;
            padding: 0px;
            width: 100%;

            &:first-child {
              border: none;
            }

            a {
              @include box-sizing(border-box);
              display: block;
              font: normal 1rem/1.2rem $sans-serif;
              height: auto;
              margin: 5px 0px;
              overflow: hidden;
              padding: 5px;
              text-overflow: ellipsis;
              @include transition(padding, 0.1s, linear);
              white-space: nowrap;
              width: 100%;

              &:hover {
                background: rgb(255,255,255);
                padding: 5px 8px;
              }
            }
          }
        }
      }
    }
  }
}