title: links not working on bootstrap xs
body: <p>I repeat the below div to create a grid of thumbnail wells using bootstrap 3. the problem is that the anchor links do not work on xs (neither the button or the image link), they do however work on sm, md and lg.</p>
  
  <pre><code>&lt;div class="col-xs-12 col-sm-6 col-md-4 col-lg-3"&gt;
    &lt;div class="thumbnail" style="height:520px;"&gt;
      &lt;a href="/movies/4539/burnt-offerings-1976"&gt;&lt;img src="https://s.ynet.io/assets/images/movies/burnt_offerings_1976/medium-cover.jpg" alt="Burnt Offerings"&gt;&lt;/a&gt;
      &lt;div class="caption"&gt;
        &lt;h5&gt;Burnt Offerings&lt;/h5&gt;
        &lt;dl class="dl-horizontal hidden-xs"&gt;
          &lt;dt&gt;Year&lt;/dt&gt;&lt;dd&gt;1976&lt;/dd&gt;
          &lt;dt&gt;Rating&lt;/dt&gt;&lt;dd&gt;6.5&lt;/dd&gt;
          &lt;dt&gt;Runtime&lt;/dt&gt;&lt;dd&gt;1:56&lt;/dd&gt;
        &lt;/dl&gt;
        &lt;p&gt;&lt;a href="/movies/4539/burnt-offerings-1976" class="btn btn-primary btn-sm btn-block"&gt;Download&lt;/a&gt;&lt;/p&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>