<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="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<h2>
Facebook Style image Button.
</h2>
<div class="dropdown">
<button class="btn btn-default btn-md dropdown-toggle" type="button" data-toggle="dropdown">
<img class="img-circle" src="https://cdn.iconscout.com/public/images/icon/free/png-512/avatar-user-boy-389cd1eb1d503149-512x512.png" width="32px" height="32px">
Logout
<span class="caret"></span></button>
<ul class="dropdown-menu" width="20px">
<li><a href="#">Logout</a></li>
</ul>
</div>
</div>
</div>
