title: CSS negative right background position
body: <p>I know I can set a negative left position on a background image like this:</p>
  
  <pre><code>#element {
      background: url(image.png) -20px 0 no-repeat;
  }
  </code></pre>
  
  <p>That'll position the background image 20px to the left of the left edge of <code>#element</code>, regardless of <code>#element</code>'s width.</p>
  
  <p>But is there any way to set a negative <em>right</em> position, <em>without</em> giving <code>#element</code> a fixed width (and then just setting a high positive left value)?</p>