title: fit background image in to a dynamic div
body: <p>i have a background image (700x500px) and i want to fill wit it a dynamic div. in this example the div is only 20px but it can have a height over 500px.</p>
  
  <pre><code>&lt;div style="background-image:url('background.jpg');width:710px"&gt;
  some content some content
  &lt;/div&gt;
  </code></pre>