SO responsive span fix

HTML

<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
<div class="container">
    
      <h1>Responsive boxes</h1>
      <div class="row-fluid">
        <div class="span2">
          <h3>M. 1</h3>
        </div>
        <div class="span3">
          <h3>M. 2</h3>
        </div>
        <div class="span3">
          <h3>M. 3</h3>
        </div>
        <div class="span3">
          <h3>M. 4</h3>
        </div>
      </div>
   
    </div> <!-- /container -->

CSS

body {
  background-color: #fff;
  font-family: 'Cabin', Helvetica, Arial, sans-serif;
 /* width: 100%;*/
  text-align: center;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Lobster', Georgia, Times, serif;
}

h3{
  color: #fff;
  font-size: 139px;
  line-height: 171px;
}

.span3 {
  background: rgb(255, 81, 10);
  height: 200px;
  overflow: hidden;
  margin-bottom: 30px;
}


/*.container{ margin-right:20px !important;}*/

JavaScript

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