title: How to set background-size to "cover", plus a little more in CSS?
body: <p>I have a container with a fixed height of 850px. I want a background-image that will keep the entire background covered at all levels of zoom. I would use <code>background-size: cover</code> however, I need it to be a little bit bigger than <code>cover</code> will make it. I want some of the background to be bleed out of the container and be unseen, for the purpose of creating a parallax. </p>
  
  <p>Basically how can I use <code>background-size: cover</code>, and increase the size a little bit on top of that? </p>
  
  <p>edit: Forgot to mention I'm also using <code>background-attachment: fixed</code>, so if I'm not mistaken, its actually calculated via the size of the browser window(?) and not the 850px tall container. How would I add that extra bleed in this case? </p>