title: How would you align the left side of a div to the center of the page?
body: <p>I have a stack of divs down the center of the page (using margin:auto)</p>
  
  <p>now I want to draw a line starting at the center and extending to the right (say 400 pixels). I'm a but stumped, any idea how to make this work nicely?</p>
  
  <p>cheers!</p>