#container {
	width:600px;
	height:auto;
	z-index:0;
	margin: 0px auto 0px auto;
}
#contents {
	width:600px;
	height:auto;
	z-index:1;
	margin: 1500px auto 0px auto;
}
#button {
	width:600px;
	height:100px;
	z-index:1;
	margin: 0px auto 0px auto;
	top:150px;
	position: absolute;
}
body {
	background-image: url(backimg.jpg);
	background-repeat: no-repeat;
	background-position: center top;
	background-attachment: fixed;
}