#room .room-background{
position: absolute !Important;
left: -171px !Important;
/* Adjust as necessary, default is "Centered"
   in respect to your avatar. */
background-image: url(http://i.imgur.com/qpwXo6P.jpg) !important; /* Have fun with this */
background-color: white !Important; /* Set this to something sensible as a failsafe */

}