#back-to-top {
	position: fixed;
	bottom: 10px;
	right: 40px;
	z-index: 9999;
	width: 32px;
	height: 32px;
	text-align: center;
	line-height: 30px;
	background: #666666;
	color: #ffffff;
	cursor: pointer;
	border: 0;
	border-radius: 2px;
	text-decoration: none;
	transition: opacity 0.2s ease-out;
	opacity: 0;
}
#back-to-top:hover {
	background: #222222;
}
#back-to-top.show {
	opacity: 1;
}