title: Change column ordering and resize
body: <p>Currently I have column for desktop that looks like this:</p>
  
  <pre><code>[ A ] [ B ]
  </code></pre>
  
  <p>But now I need to change it when viewed in mobile in this order and size</p>
  
  <pre><code>[ B ]
  [ A ]
  </code></pre>
  
  <p>How can I achieve it with Boostrap?</p>