title: css 100% width when horizontall scrollbar
body: <p>I want to have a header with 100% width,
  in some cases there is a horizontal scrollbar and that 
  causes the div to cover the visible area and not the whole
  parent element. </p>
  
  <pre><code>.cont {
  width: 100%;
  }
  </code></pre>
  
  <p><a href="http://jsfiddle.net/BhRdV/1/" rel="nofollow">http://jsfiddle.net/BhRdV/1/</a></p>