title: Bootstrap - using only the first 6 columns
body: <p>In Bootstrap is it ok if I write this code, to use only 6 columns in a row?
  What happens with the other 6 columns?</p>
  
  <pre><code>&lt;div class="row"&gt;
      &lt;div class="col-xs-4"&gt;some text&lt;/div&gt;
      &lt;div class="col-xs-2"&gt;some text&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>