Tutorial

If you want to add your own background...
use the code below. The background will only remain on the page that you posted it on.

<text/javascript>body {
  margin-top: 0px;
  margin-$endSide: 0px;
  margin-bottom: 0px;
  margin-$startSide: 0px;
  background:#123 url("url here");
  background-position: 50% 31px;
  text-align:center;
  font:x-small Verdana, Arial, Sans-serif;
  color:$textcolor;
  font-size/* */:/**/small;
  font-size: /**/small;
}</script>