The following code shows how to create span4 well.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
</head><!--from w w w . j a v a 2s . c om-->
<body style='margin:30px'>
<div class="span4 well">
<ul class="nav nav-list">
<li class="nav-header">Recent news</li>
<li><a href="">
<i class="icon icon-play"></i> Introducing</a></li>
<li class="divider"></li>
<li><a href=""><i
class="icon icon-play"></i> Do</a></li>
<li class="divider"></li>
<li><a href="">
<i class="icon icon-play"></i> News</a></li>
<li class="divider"></li>
<li><a href="">
<i class="icon icon-play"></i> Air</a></li>
<li class="divider"></li>
</ul>
</div>
</body>
</html>