html,body{width:100%;height:100%;margin:0;padding:0;}
#bg{position:absolute;top:0;left:0;z-index:-1;width:100%;height:100%;background-color:white;z-index:-1;background-position:center center;background-size:contain;}
#bg.tile{background-size:auto auto;}
html{background:black;}
body{background:transparent;}