#back-top {
	position: fixed;
	bottom: 10px;
	right: 20px;
}
#back-top a {
	width: 60px;
	display: block;
	text-align: center;
	font: 8px/100% Arial, Helvetica, sans-serif;
	text-transform: uppercase;
	text-decoration: none;
	color: #bbb;
}
#back-top a:hover {
	color: #000;
}
/* arrow icon (span tag) */
#back-top span {
	width: 60px;
	height: 60px;
	display: block;
	margin-bottom: 5px;
	background: url(https://www.taimei-g.com/lib/scroll/arrow_w_off.gif) no-repeat center center;
}
#back-top a:hover span {
	background: url(https://www.taimei-g.com/lib/scroll/arrow_w_on.gif) no-repeat center center;
}