title: Center Thumbnail Button Bootstrap
body: <p>I am using the latest version of bootstrap however I cannot seem to work out how to center the button in the following piece of code. I only want it for this specific thumbnail and not globally so I cant change the css.</p>
  
  <pre><code>&lt;div class="row"&gt;   
    &lt;ul class="thumbnails"&gt;
      &lt;li class="span4"&gt;
        &lt;div class="thumbnail"&gt;
          &lt;img src="http://placehold.it/400x200" alt=""&gt;
          &lt;h3&gt;Need A Price?&lt;/h3&gt;
          &lt;p&gt;Fill in the Quote form and get a price within   30mins,We know you dont like waiting around&lt;/p&gt;
            &lt;div class="btn-group"&gt;
              &lt;button class="btn btn-primary"&gt;Get A Quote&lt;/button&gt;
            &lt;/div&gt;
        &lt;/div&gt;
      &lt;/li&gt;
   &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>