.back_to_top {
	width: 40px;
	height: 40px;
	background-color: rgba(0, 0, 0, 0.65);
	color: #FFF;
	cursor: pointer;
	text-align: center;
	position: fixed;
	right: 10px;
	bottom: 10px;
	padding-top: 9px;
	display: none;
	z-index: 999;
	transition-duration: .2s;
	transition-property: background-color;
}

.back_to_top:hover {
	background-color: #9D0000;
	/*background-color: #102030;*/
}