<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="col-sm-3 col-md-2 sidebar"> <ul class="nav nav-sidebar"> <li class="active"><a href="#">MenuItem#1</a></li> <li class="dropdown-submenu"> <a tabindex="-1" href="#">MenuItem#2</a> <ul class="dropdown-menu"> <li><a tabindex="-1" href="#">Second level</a></li> <li class="dropdown-submenu"> <a href="#">More..</a> <ul class="dropdown-menu"> <li><a href="#">3rd level</a></li> <li><a href="#">3rd level</a></li> </ul> </li> <li><a href="#">Second level</a></li> <li><a href="#">Second level</a></li> </ul> </li> </ul> </div>

body { padding-top: 60px; padding-bottom: 40px; } .dropdown-submenu{position:relative;} .dropdown-submenu>.dropdown-menu{top:0;left:100%;margin-top:-6px;margin-left:-1px;-webkit-border-radius:0 6px 6px 6px;-moz-border-radius:0 6px 6px 6px;border-radius:0 6px 6px 6px;} .dropdown-submenu:hover>.dropdown-menu{display:block;} .dropdown-submenu>a:after{display:block;content:" ";float:right;width:0;height:0;border-color:transparent;border-style:solid;border-width:5px 0 5px 5px;border-left-color:#cccccc;margin-top:5px;margin-right:-10px;} .dropdown-submenu:hover>a:after{border-left-color:#ffffff;} .dropdown-submenu.pull-left{float:none;}.dropdown-submenu.pull-left>.dropdown-menu{left:-100%;margin-left:10px;-webkit-border-radius:6px 0 6px 6px;-moz-border-radius:6px 0 6px 6px;border-radius:6px 0 6px 6px;} .col-md-2{ width:8.666666666666664% }