title: Bootstrap 3 modal shows a transparent background
body: <p>I created a simple HTML with bootstrap 3.2 :</p>
  
  <pre><code>&lt;body&gt;
      &lt;div&gt;
          &lt;a class="btn" href="#frmLogin" data-toggle="modal"&gt;login&lt;/a&gt;
      &lt;/div&gt;
  
      &lt;div class="modal fade" id="frmLogin" role="dialog"&gt;
          &lt;div class="modal-dialog"&gt;
              &lt;div class="modal-content&gt;"&gt;
                  &lt;div class="modal-header"&gt;
                      &lt;a class="btn" data-dismiss="modal"&gt;×&lt;/a&gt;
                      &lt;h3 id="modalTitle"&gt;Login&lt;/h3&gt;
                  &lt;/div&gt;
  
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>but the modal does not show correctly.</p>
  
  <p>fiddle link : <a href="http://jsfiddle.net/jsmLxhv9/1/" rel="noreferrer">http://jsfiddle.net/jsmLxhv9/1/</a></p>