title: Content jumps horizontally whenever browser adds a scrollbar
body: <p>I'm using a fixed width body and auto margins to center my content in the middle of the page.  When the content exceeds the page's height and the browser adds a scrollbar, the auto margins force the content to jump half the width of the scrollbar left.</p>
  
  <p>Is comparing outerHeight with window.innerHeight an appropriate way of solving this?  Is there another way to solve this?</p>
  
  <p>I think this should be enough info for the problem, but let me know if I can answer anything else.</p>
  
  <p>Edit for clarification: I don't want to force the scrollbar to appear.  </p>