body {
	font-family: tahoma, helvetica, arial, sans-serif;
	font-size: 10px;
	text-align: center;
	margin: 0px;
	padding: 10px;
	background:#7cd23c;
	text-align:center;
	width: 500px;
}
#principal {
	position: absolute;
	left: 50%;
	top: 50%;
	width: 600px;
	height: 600px;
	margin-top: -300px;
	margin-left: -300px;
	overflow: auto;
}
#cs1 {
	width: 600px;
	height:233px;
	background: url(img/01.jpg) no-repeat;
}
#cs2 {
	width: 600px;
	height:150px;
	background: url(img/02.jpg) no-repeat;
	float: right;
}
#cs3 {
	width: 600px;
	height:217px;
	background: url(img/03.jpg) no-repeat;
	float: right;
}