a.back-to-top {
	display: none;
	width: 40px;
	height: 40px;
	text-indent: -9999px;
	position: fixed;
	z-index: 999;
	right: 20px;
	bottom: 25px;
	background: #333435 url("../img/totop/up-arrow.png") no-repeat center 43%;
	opacity:0.7;
}
a:hover.back-to-top {
	background-color: #333435;
	opacity:1.0;
}