body {
    -ms-overflow-style: scrollbar;
}

a.back-to-top {
	display: none;
	width: 30px;
	height: 30px;
	text-indent: -9999px;
	position: fixed;
	right: 0;
	bottom: 90px;
	background: url("/image/arrow-up.png") no-repeat center;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
    opacity:0.5;
	box-sizing:border-box;
}
a.back-to-top.showed {
    display:inline;
    z-index:9999999;
    transform: translateZ(0px);
}
a.back-to-top:hover {
	background-color: #F58C3A;
    border-color:#F58C3A;
    opacity:1;
	cursor: pointer;
}