html, body {
  margin: 0px;
}
#background {
  position:absolute;
  top:0;
  right:0;
  left:0;
  bottom:0;
  width:100%;
  height:100%;
  z-index:0;
}
#mhcontent {
  position:absolute;
  overflow:auto;
  z-index:1;
  top:0;
  right:0;
  left:0;
  bottom:0;
  padding: 5px;
  background: transparent;
}