#page_top {
	width: 50px;
	height: 50px;
	position: fixed;
	right: 0;
	bottom: 0;
	background: gray;
	opacity: 0.6;
	border-radius: 50%;
}

#page_top a {
	padding: 14px 7px;
	font-size: 18px;
	position: relative;
	display: block;
	width: 50px;
	height: 50px;
	text-decoration: none;
	color: #fff;
}