bootstrap nav center, stackoverflow answer
by kuyabiye
HTML
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4 dropdown-center">
<div class="dropdown">
<a id ="dLabel" data-toggle="dropdown" href="#">Despliega menú<span class="caret"></span></a>
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
<li role="presentation">
<a role="menuitem" tabindex="-1" href="www.google.com" target="_blank">Google</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="www.facebook.com" target="_blank">Facebook</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="www.stackoverflow.com" target="_blank">Stack Overflow</a>
</li>
<li role="presentation" class="divider"></li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#" target="_blank">Mi Web</a>
</li>
</ul>
</div>
<!-- /div.dropdown -->
</div>
<!-- /div.col-md-4 .col-md-offset-4 -->
</div>
<!-- /div.row -->
</div>
<!-- /div.container -->
CSS
.dropdown-center {
text-align: center;
}
.dropdown-center .dropdown {
display: inline-block;
}