 <div class="sidebar-footer hidden-small">
              <a data-toggle="tooltip" data-placement="top" title="Settings">
                <span class="glyphicon glyphicon-cog" aria-hidden="true"></span>
              </a>
              <a data-toggle="tooltip" data-placement="top" title="FullScreen">
                <span class="glyphicon glyphicon-fullscreen" aria-hidden="true"></span>
              </a>
              <a data-toggle="tooltip" data-placement="top" title="Lock">
                <span class="glyphicon glyphicon-eye-close" aria-hidden="true"></span>
              </a>
              <a data-toggle="tooltip" data-placement="top" href = "logout.php" title="Logout">
                <span class="glyphicon glyphicon-off" aria-hidden="true"></span>
              </a>
 </div>