title: bootstrap .btn-group-justified not work as expected
body: <p><img src="https://i.stack.imgur.com/RBKdr.png" alt="md"></p>
  
  <p><img src="https://i.stack.imgur.com/8qfk6.png" alt="sm"></p>
  
  <p><img src="https://i.stack.imgur.com/ah7xf.png" alt="enter image description here"></p>
  
  <p>How can I get rid of questionmark filed??? I need to fill it by "button" with "another h3".
  "h3 again" and "some h3" is below "another h3" and there is more of these.</p>
  
  <p>My html:</p>
  
  <pre><code>&lt;div class="btn-group btn-group-justified"&gt;
          &lt;div class="col-md-4 col-sm-6 col-xs-12 "&gt;
              &lt;a href="#" class="btn btn-wrap btn-default"&gt;
                  &lt;h2&gt;another h3&lt;/h2&gt;
                  &lt;img class="/images/img4.png"&gt;
  
              &lt;/a&gt;
          &lt;/div&gt;
          &lt;div class="col-md-4 col-sm-6 col-xs-12 "&gt;
              &lt;a href="#" class="btn btn-wrap btn-default"&gt;
                  &lt;h2&gt;h3 again&lt;/h2&gt;
                  &lt;img class="imageClip" src="/images/img2.png"&gt;
  
              &lt;/a&gt;
          &lt;/div&gt;
          &lt;div class="col-md-4 col-sm-6 col-xs-12 "&gt;
              &lt;a href="#" class="btn btn-wrap btn-default"&gt;
                  &lt;h2&gt;some h3&lt;/h2&gt;
                  &lt;img class="imageClip" src="/images/img1.png"&gt;
  
              &lt;/a&gt;
          &lt;/div&gt;
  
  &lt;/div&gt;
  </code></pre>