body{background: #633726 url(bg.png?v=2) top center no-repeat;background-position: center 50px;}

@media screen and (max-width: 700px) {
	body{overflow-x:hidden;background: #751b1b url(mbg.png?v=1) top center no-repeat;background-size:100%;background-position: center 50px;}
}