div {
	width:300px;
	height:200px;
	border:1px;
	border-style:solid;
	background-image:url("imagenes/papel1.png"), url("imagenes/papel2.png"), url("imagenes/papel3.png"), url("imagenes/papel4.png");
	background-position:left top, right top, left bottom, right bottom;
	background-repeat:no-repeat;
}