title: Bootstrap: fluid layout with no external margin
body: <p>if i have:</p>
  
  <pre><code>&lt;div class="container-fluid"&gt;
     &lt;div class="row-fluid"&gt;
        &lt;div class="span8"&gt;
               Some Element....
         &lt;/div&gt;
         &lt;div class="span4"&gt;
               Other Element
         &lt;/div&gt;   
     &lt;/div&gt;       
  &lt;/div&gt;
  </code></pre>
  
  <p>With this code i have some margin from left and right window borders. How can eliminate these margins?</p>
  
  <p></p>
  
  <p>Thanks for your support</p>