         <li class="ripple">
                      <a href="calendar.html">
                         <span class="fa fa-calendar-o"></span>Calendar
                      </a>
                    </li>
                    <li class="ripple">
                      <a class="tree-toggle nav-header">
                        <span class="fa fa-envelope-o"></span>Mail
                        <span class="fa-angle-right fa right-arrow text-right"></span>
                      </a>
                      <ul class="