title: How do I add margin above images in Bootstrap3?
body: <p>When I make the browser window small, the images are clumped together, I want to add some spacing between them, when they stack vertically, note that I also want to do this in pure bootstrap, because I know how to do it in css.</p>
  
  <p>Code:</p>
  
  <pre><code>&lt;div class="col-lg-3 col-md-3 col-sm-6 col-xs-12"&gt;
          &lt;img class="img-responsive center-block" src="http://via.placeholder.com/250x250"&gt;
        &lt;/div&gt;
        &lt;div class="col-lg-3 col-md-3 col-sm-6 col-xs-12"&gt;
          &lt;img class="img-responsive center-block" src="http://via.placeholder.com/250x250"&gt;
        &lt;/div&gt;
  </code></pre>