@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain(forums.mozillazine.org) {

  #sidebar {
    background-color: #066;
    background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABsAAABgAQMAAADW%2F5sUAAAAFXRFWHRDcmVhdGlvbiBUaW1lAAfWBQgHOTmEKAJKAAAAB3RJTUUH1gUICBMGg3hHEgAAAAlwSFlzAAAOwwAADsMBx2%2BoZAAAAAZQTFRFAGZm%2F%2F%2F%2Frea17wAAAFxJREFUeNpjYMAJ5ECEIohQABESIIINRDDCJeQY8AE%2BEMGCl%2BDDa4AdwgUNmIQiXAlOIA8iBOAEGhchhhPYgAglOIFwEILA7wIeOCGEStijmkKsC5TgYipwLj4DAJEHCFAH2yXKAAAAAElFTkSuQmCC);
    background-position: right 250px;
    background-repeat: no-repeat;
    background-attachment: fixed;
    padding-left: 20px !important;
  }

  #sidebar:hover {
    background-color: transparent;
    background-image: none;
    padding-left: 7px !important;
   }

  #sidebar > * {
    display: none;
  }

  #sidebar:hover > * {
    display: block;
  }
}