.backtotop {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    /* border: 5px double hsla(0,0%,61%,.36); */
    bottom: 20px;
    cursor: pointer;
    height: 40px;
    padding: 6px;
    position: fixed;
    right: 15px;
    text-align: center;
    width: 40px;
    z-index: 99;
    overflow: hidden;
    display: none;
}

.backtotop::before {
    bottom: 11px;
    color: #fff;
    content: "\E5CE";
    font-family: Material Icons;
    font-size: 26px;
    left: 8px;
    position: absolute;
    text-align: center;
}