title: Iframe 100% height inside body with padding
body: <p>I have an iframe in my HTML document and I'm having a bit of trouble.</p>
  
  <p>I also have a URL bar (fixed position element) at the top of the page that should stay with the user as they scroll. That works fine. I'd like the iframe to fill the remaining space but not be covered up by the URL bar.</p>
  
  <p>This is what I'm talking about. <a href="http://s75582.gridserver.com/Ls" rel="nofollow noreferrer">http://s75582.gridserver.com/Ls</a></p>
  
  <p>How can I fix this so that the URL bar doesn't cover up part of the page? When I try setting padding in the body, it just creates an extra, annoying scroll bar.</p>