The following code shows how to create fluid layout with span3.
<!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>
<style type='text/css'>
.mobile-two h3 {<!-- w w w . ja v a 2s. com-->
min-height: 120px;
}
</style>
</head>
<body>
<div class="hero-unit">
<h1>Opening This Week!</h1>
<div class="row-fluid">
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>test small</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
<div class="span3 mobile-two">
<h3>The Incredible Burt Wonderstone</h3>
<img src="http://placehold.it/80x50" />
</div>
</div>
<p>These movies open this Friday!</p>
<p>
<a class="btn btn-primary btn-small" href="#coming-soon">See
Showtimes »</a>
</p>
</div>
</body>
</html>