The following code shows how to compare three size wells.
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<link rel="stylesheet"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap-theme.min.css">
<script type="text/javascript"
src="http://code.jquery.com/jquery.min.js"></script>
<script
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
<style type="text/css">
.bs-example {<!-- w w w.j a v a 2 s . c o m-->
margin: 20px;
}
</style>
</head>
<body>
<div class="bs-example">
<div class="well">Look, I'm in a well!</div>
<div class="well well-lg">Look, I'm in a large well!</div>
<div class="well well-sm">Look, I'm in a small well!</div>
</div>
</body>
</html>