title: is there something like background-margin?
body: <p>I'm used to position divs X px from the middle like this:</p>
  
  <pre><code>#theDiv
  {
      position:       absolute;
      top:            50%;
      left:           50%;
      margin-top:     -50px;
      margin-left:    -100px;
  }
  </code></pre>
  
  <p>Now I want to archive something similiar with my body background:</p>
  
  <pre><code>body
  {
      background-position:    50% 50%;
      /*background-margin-top:    -100px from the middle...*/
  
  }
  </code></pre>
  
  <p>I know how this can be achieved with an additional div and using z-indexes,
  but is there really not an easier approach?</p>