title: Full-width div on mobile
body: <p>I have this blue top <a href="http://textarea-teste.aws.af.cm/" rel="nofollow noreferrer">link here</a> and this top is taking all width size, and that's what I want. So if you resize your window or open it on mobile this blue div is putting margins both sides, twitter bootstrap responsive is doing that. My code is exactly like <a href="https://stackoverflow.com/questions/13838482/twitter-bootstrap-making-footer-run-full-width">this answer</a> but tb still putting margins, that's my code:</p>
  
  <pre><code>&lt;!-- this div is inserting blue bg image and wrap all content --&gt;
  &lt;div class="background-top"&gt; 
      &lt;div class="container"&gt;
          &lt;div class="span6"&gt;&lt;/div&gt;
          &lt;div class="span6"&gt;&lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>