title: Shift centered site layout to one side according to rule (using css)
body: <p>I have a fixed size layout, centered using <code>margin: 0 auto</code>. I wonder whether it is possible to do such a thing with CSS: i need my layout to have right margin two times less then left. Something like:</p>
  
  <pre><code>&lt;-- (2*n px margin) [fixed width div] (n px margin) --&gt;
  </code></pre>
  
  <p>How? (using css only)</p>