title: How do I get this modal dialog to scroll on mobile?
body: <p>I have a modal dialog (overlay) that responsively fills the full width and height of the viewport on small screens. When there is a lot of vertical content, the mobile user needs to be able to scroll. I'm using Polymer's core-overlay.</p>
  
  <p>See <a href="http://mycommunity.org" rel="nofollow">http://mycommunity.org</a> and click Add Stuff, then make your browser window smaller.</p>