Responsive Horizontal-to-Scrollable Menu

This example shows how you can build upon Pure menu classes such as pure-menu-horizontal and pure-menu-scrollable. At wide window-widths we display a horizontal menu. At smaller window-widths, we switch to a scrollable horizontal menu with a toggle control. Remember that the JavaScript provided is plain vanilla JS so it won't work in some browsers; you'll need to polyfill or adapt the code to your library of choice.

Code reproduced below:

<style>
      .custom-menu-wrapper {
          background-color: #808080;
          margin-bottom: 2.5em;
          white-space: nowrap;
          position: relative;
      }

      .custom-menu {
          display: inline-block;
          width: auto;
          vertical-align: middle;
          -webkit-font-smoothing: antialiased;
      }

      .custom-menu .pure-menu-link,
      .custom-menu .pure-menu-heading {
          color: white;
      }

      .custom-menu .pure-menu-link:hover,
      .custom-menu .pure-menu-heading:hover {
          background-color: transparent;
      }

      .custom-menu-top {
          position: relative;
          padding-top: .5em;
          padding-bottom: .5em;
      }

      .custom-menu-brand {
          display: block;
          text-align: center;
          position: relative;
      }

      .custom-menu-toggle {
          width: 44px;
          height: 44px;
          display: block;
          position: absolute;
          top: 3px;
          right: 0;
          display: none;
      }

      .custom-menu-toggle .bar {
          background-color: white;
          display: block;
          width: 20px;
          height: 2px;
          border-radius: 100px;
          position: absolute;
          top: 22px;
          right: 12px;
          -webkit-transition: all 0.5s;
          -moz-transition: all 0.5s;
          -ms-transition: all 0.5s;
          transition: all 0.5s;
      }

      .custom-menu-toggle .bar:first-child {
          -webkit-transform: translateY(-6px);
          -moz-transform: translateY(-6px);
          -ms-transform: translateY(-6px);
          transform: translateY(-6px);
      }

      .custom-menu-toggle.x .bar {
          -webkit-transform: rotate(45deg);
          -moz-transform: rotate(45deg);
          -ms-transform: rotate(45deg);
          transform: rotate(45deg);
      }

      .custom-menu-toggle.x .bar:first-child {
          -webkit-transform: rotate(-45deg);
          -moz-transform: rotate(-45deg);
          -ms-transform: rotate(-45deg);
          transform: rotate(-45deg);
      }

      .custom-menu-screen {
          background-color: rgba(0, 0, 0, 0.5);
          -webkit-transition: all 0.5s;
          -moz-transition: all 0.5s;
          -ms-transition: all 0.5s;
          transition: all 0.5s;
          height: 3em;
          width: 70em;
          position: absolute;
          top: 0;
          z-index: -1;
      }

      .custom-menu-tucked .custom-menu-screen {
          -webkit-transform: translateY(-44px);
          -moz-transform: translateY(-44px);
          -ms-transform: translateY(-44px);
          transform: translateY(-44px);
      }

      @media (max-width: 62em) {

          .custom-menu {
              display: block;
          }

          .custom-menu-toggle {
              display: block;
              display: none\9;
          }

          .custom-menu-bottom {
              position: absolute;
              width: 100%;
              border-top: 1px solid #eee;
              background-color: #808080\9;
              z-index: 100;
          }

          .custom-menu-bottom .pure-menu-link {
              opacity: 1;
              -webkit-transform: translateX(0);
              -moz-transform: translateX(0);
              -ms-transform: translateX(0);
              transform: translateX(0);
              -webkit-transition: all 0.5s;
              -moz-transition: all 0.5s;
              -ms-transition: all 0.5s;
              transition: all 0.5s;
          }

          .custom-menu-bottom.custom-menu-tucked .pure-menu-link {
              -webkit-transform: translateX(-140px);
              -moz-transform: translateX(-140px);
              -ms-transform: translateX(-140px);
              transform: translateX(-140px);
              opacity: 0;
              opacity: 1\9;
          }

          .pure-menu-horizontal.custom-menu-tucked {
              z-index: -1;
              top: 45px;
              position: absolute;
              overflow: hidden;
          }

      }
      </style>
      <div class="custom-menu-wrapper">
          <div class="pure-menu custom-menu custom-menu-top">
              <a href="#" class="pure-menu-heading custom-menu-brand">Brand</a>
              <a href="#" class="custom-menu-toggle" id="toggle"><s class="bar"></s><s class="bar"></s></a>
          </div>
          <div class="pure-menu pure-menu-horizontal pure-menu-scrollable custom-menu custom-menu-bottom custom-menu-tucked" id="tuckedMenu">
              <div class="custom-menu-screen"></div>
              <ul class="pure-menu-list">
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Home</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">About</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Contact</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Blog</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">GitHub</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Twitter</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Apple</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Google</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Wang</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">Yahoo</a></li>
                  <li class="pure-menu-item"><a href="#" class="pure-menu-link">W3C</a></li>
              </ul>
          </div>
      </div>
      <script>
      (function (window, document) {
      document.getElementById('toggle').addEventListener('click', function (e) {
          document.getElementById('tuckedMenu').classList.toggle('custom-menu-tucked');
          document.getElementById('toggle').classList.toggle('x');
      });
      })(this, this.document);
      </script>