title_body: What CSS can I use to change the background color of an epub on a Nook HD? I'm having a really hard time changing the background color of my epub on the Nook HD.
  
  I've tried doing:
  
  body {
      background-color: red;
  }
  
  
  (Not that I would actually use red, I just want to see a difference.)
  
  Nothing.
  
  I've tried putting a div around the whole thing, and doing something like:
  
  #myDiv {
      width: 100%;
      height: 100%;
      background-color: red;
  }
  
  
  And, that almost works, but it doesn't expand the whole way. There is still white areas at the top and bottom that just stay a white background. Also, once a page ends, it only covers up until there's no text.
  
  I've tried a bunch of other things too, but I just can't seem to figure it out.
  
  Anyone have any ideas?
  
  (And, yes, publisher's defaults is on.)
upvoted_answer: well this looks like a html/css question the height percentage in the css also needs that its parent has height as well
  
  so you can try this.
  
  html, body {
     height:100%;
  }
  
  
  and use your #myDiv coloring.