#back_to_top {
	color: #fff;
	height: auto;
	position: fixed;
	bottom: 65px;
	margin: 0;
	z-index: 101;
	-webkit-transition: all .3s ease 0s;
	-moz-transition: all .3s ease 0s;
	-o-transition: all .3s ease 0s;
	transition: all .3s ease 0s;
	right: 38px;
	opacity: 0;
	filter: alpha(opacity=0);
	visibility: hidden;
}

#back_to_top.on {
	opacity: 1;
	filter: alpha(opacity=100);
	visibility: visible;
	right: 38px;
}

#back_to_top>span {
	$back-to-top-size: 40px;

	width: $back-to-top-size;
	height: $back-to-top-size;
	line-height: $back-to-top-size;
	text-decoration: none;
	background: transparent;
	text-align: center;
	border: 2px solid $eltdf-first-color;
	color: $eltdf-first-color;
	opacity: .5;
	font-size:30px;

	@include eltdf-border-radius(50%);
	@include eltdf-transition(all .2s ease 0s);
}

#back_to_top:hover>span {
	background-color: $eltdf-first-color;
	border-color: $eltdf-first-color;
	opacity: 1;
	color:#fff;
}