title: Have border-radius cover inner divs
body: <p>I have a Coda slider on one webpage (hand-crafted, not using the plugin, but that's irrelevant) and the outer div has a border-radius.</p>
  
  <p>A bunch of inner divs have background colors, but they stick out on top of the corners when I want them to be BEHIND the rounded corner.</p>
  
  <p>Is there any way to achieve this?</p>