title: Remove margin in Chrome browser action popup
body: <p>I have a Chrome extension with a <a href="http://code.google.com/chrome/extensions/browserAction.html" rel="noreferrer">browser action</a> that is trying to imitate the visual style of a different app. Part of this style is a header and footer that extend to the edges of the app. The problem is that the browser action popup contains a small margin and rounded border by default that appears to be hard coded to display as white space. </p>
  
  <p>It would be nice if there was some way to either remove this margin or force my content to be able to extend all the way to the edges. Does anyone know of a way to do this? (I highly suspect that there's nothing to be done, but it never hurts to ask, right?)</p>
  
  <p>Oh, and for the record, negative margins get you nowhere in this case. :(</p>