html{
	display: block;
	font-size: 62.5%;
	height: 100%;
	max-width: 640px;
	margin: 0 auto;
	padding: 0;
}
body{
	max-width: 640px;
	overflow: hidden;
	margin: 0 auto;
	background: no-repeat;
	background-position:top center;
	background-size:100%;
	height: auto;
}
.logo{
	display: block;
	width: 100%;
	margin: 0 auto;
	height:8rem;
	background-size: 50rem;
	background-position: top center;
}
.button a{
	text-align: center;
	display: block;
	width: 4.68rem;
	height: 4.68rem;
	float: left;
}
.button a img{
	width: 4.6rem;
	height: 4.6rem;
}