.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1;
    width: 50px;
    height: 50px;
    /*background: #DDD;*/
    opacity: 0.5;
    display: none;
}
.back-to-top :hover {
	opacity: 1;
	cursor: pointer;
}

.back-to-top i {
	font-size: 25px;
	padding: 12px;
	color: #FFF;
}