body {
	background: top center/1000px 100px repeat-y url("./layout/body_background.jpg");
}
article {
	background: top center/1000px 1000px no-repeat url("./layout/visual_background.jpg");
}
article div.contents {
	width: 1000px;
	margin: 0px auto;
	padding-top: 500px;
	padding-bottom: 30px;
}
article div.contents div.box_a,
article div.contents div.box_b {
	width: 600px;
	padding: 40px;
	margin: 40px auto;
	border-radius: 10px;
}

article {
	width: 1000px;
}

footer {
	width: 1000px;
}