.back-to-top {
    color: #666;
    cursor: pointer;
    font-weight: bold;
    font-size: 20px;
    padding: 20px;
    position: fixed;
    right: 60px;
    bottom: 90px;
    z-index: 25;
    background: #b7b7b5;
    text-align: center;
}

.back-to-top:hover {	
	background-color: #666;
	color: #FFF;
	font-size: 20px;
}