title: Make child div stretch across width of page
body: <p>Suppose I have the following HTML code:</p>
  
  <pre><code>&lt;div id="container" style="width: 960px"&gt;
     &lt;div id="help_panel" style="width: 100%; margin: 0 auto;"&gt;
       Content goes here.
     &lt;/div&gt; 
  &lt;/div&gt;
  </code></pre>
  
  <p>If I want the help_panel div to stretch across the width of the page/broswer, even if the width of the page/browser is wider than 960px (which is the width set for the container div), is it possible to do it with the above structure?  I want to get the help panel div to expand beyond the width limits set in the container div if the page is wider than 960px.  </p>
  
  <p>I am curious if this can be accomplished with the above structure.  Or will I have to put the help_panel div outside of the container div to make it work?  </p>
  
  <p>Thanks!</p>