#box1 { 
	top:0px;
	left:0px;
	height:100px;
	width:600px;
	position:absolute;
	background:rgb(0,0,0);
}
#box2 {
	top:100px;
	left:0px;
	height:100px;
	width:600px;
	position:absolute;
	background:rgb(255,0,0);
}
#box3 {
	top:200px;
	left:0px;
	height:100px;
	width:600px;
	position:absolute;
	background:rgb(255,255,0);
}