scroll dropdown bootstrap
<ul class="dropdown-menu scrollable-menu" role="menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li><a href="#">Action</a></li> .. <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> </ul>