title: How to stretch a header across a web page background with CSS
body: <p><a href="http://www.stumbleupon.com/" rel="noreferrer">http://www.stumbleupon.com/</a></p>
  
  <p><a href="http://www.mixx.com/" rel="noreferrer">http://www.mixx.com/</a></p>
  
  <p>Both of these websites have a background header stretched across the page while the content is centered and is covering like say 80% of the width, and that also perfectly aligns with the rest of the layout.</p>
  
  <p>I am particularly interested in these two sites, because the header has two background colors, not just one.</p>
  
  <p>I am sure there are tons of tutorials on the web, but I do not the keywords to search for.</p>