body {
	font-family: Helvetica, Arial, sans-serif;
	color: #000;
	background: #ccc url(background.jpg) no-repeat fixed center center;
}

#main_contents_box {
	background-color: gray;
	color: white;
	width: 700px;
	height: 500px;
	border: 5px solid black;
	vertical-align: top;
	padding: 30px;
	text-align: left;
	margin-left: auto;
	margin-right: auto;
}

#content_header {
	color: white;
	text-align: center;
}

#main_contents {
	color: white;
	text-align: center;
}

a {
	color: white;
	text-decoration: none;
}

img {
	border: 2px solid silver;
}