title: Positioning nested divs
body: <p>I am trying to position divs nested within a centred wrapper so that they don't move when I adjust the size of a browser. The idea is similar to the Facebook homepage where all the divs stay centred and don't move relative to each other when the page is made bigger.</p>
  
  <p>All of my divs are nested in this:</p>
  
  <pre><code>#header {
      width: 750px;
      margin: 0 auto;
      }
  </code></pre>
  
  <p>What do I have to do to position the divs within? Is it something to do with positioning?</p>
  
  <p>Sorry this is a bit of a vague explanation, please do ask for clarification!</p>
  
  <p>Any help would be much appreciated, thanks.</p>