<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/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="container"> <div class="row"> <div class="dropdown"> <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" data-toggle="dropdown"> Topmost Menu <span class="caret"></span> </button> <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu1"> <li><a>Menu Option 1</a></li> <li><a>Menu Option 2</a></li> <li class="dropdown-submenu"> <a tabindex="-1" href="#">Menu Option 3</a> <ul class="dropdown-menu"> <li><a tabindex="-1" href="#">Menu Option 3-1</a></li> <li class="dropdown-submenu"> <a href="#">Menu Option 3-2</a> <ul class="dropdown-menu"> <li><a href="#">Menu Option</a></li> <li><a href="#">Menu Option</a></li> </ul> </li> <li><a href="#">Menu Option 3-3</a></li> <li><a href="#">Menu Option 3-4</a></li> </ul> </li> <li class="dropdown-submenu"> <a tabindex="-1" href="#">Menu Option 4</a> <ul class="dropdown-menu"> <li><a tabindex="-1" href="#">Menu Option 4-1</a></li> <li class="dropdown-submenu"> <a href="#">Menu Option 4-2</a> <ul class="dropdown-menu"> <li><a href="#">Menu Option</a></li> <li><a href="#">Menu Option</a></li> </ul> </li> <li><a href="#">Menu Option 4-3</a></li> <li><a href="#">Menu Option 4-4</a></li> </ul> </li> </ul> </div> </div> </div>

.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; 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: #ccc; margin-top: 5px; margin-right: -10px; } .dropdown-submenu:hover>a:after { border-left-color: #fff; } .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; }