<div class="dropdown">
<button aria-expanded="false" aria-haspopup="true" class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">
dropdown
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>