title: Cannot get bootstrap button to align center when working with href
body: <p>If I remove the  tag the button aligns perfectly but it doesn't link. I've tried multiple combinations with the anchors and no success. Please help.</p>
  
  <p>NOT ALIGNING MIDDLE:</p>
  
  <pre><code>&lt;div class="span12" style="text-align:center"&gt;
      &lt;a href="mailto:partnerships@medicaldoctorapps.com"&gt;
        &lt;button class="btn btn-large btn-primary"&gt;Contact us to get started&lt;/button&gt;
      &lt;/a&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>ALIGNS MIDDLE FINE BUT NO LINK OUT:</p>
  
  <pre><code>&lt;div class="span12" style="text-align:center"&gt;
      &lt;button class="btn btn-large btn-primary"&gt;Contact us to get started&lt;/button&gt;
  &lt;/div&gt;
  </code></pre>