The login element in Bootstrap:
<!-- An container element with the class dropdown is needed.
Without it, the dropdown-menu elements are going all the way down -->
<div class="dropdown">
<a href="#" data-toggle="dropdown" class="dropdown-toggle">
<span class="glyphicon glyphicon-user"></span><b class="caret"></b></a>
<ul class="dropdown-menu">
<li>
<a href="/users/id" title="Profile">Profile</a>
</li>
<li>
<a href="/logout" title="Logout">Logout </a>
</li>
</ul>
</div>
where: