body {
	margin: 0;
	padding: 0;
	overflow: hidden;
}

.back {
	position: absolute;
	top: 10px;
	left: 10px;
	text-decoration: none;
	color: #000;
	background-color: #fff;
	padding: 5px;
	border-radius: 5px;
	z-index: 10;
	border: 1px solid #000;
}