       <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="nav nav-list tree">
                        <li><a href="mail-box.html">Inbox</a></li>
                        <li><a href="compose-mail.html">Compose Mail</a></li>
                        <li><a href="view-mail.html">View Mail</a></li>
                      </ul>
                    </li>
                