<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>

scroll dropdown bootstrap

.scrollable-menu { height: auto; max-height: 200px; overflow-x: hidden; }

scroll dropdown bootstrap