.backtotop {
    position: fixed;
    width: 50px;
    height: 100vh;
    left: 0;
    top: 0;
}

.backtotop .icon {
    font-size: 1rem;
    position: relative;
    top: 50vh;
    margin-top: -5px;
    color: rgba(0, 0, 0, 0.2);
}

.backtotop:hover .icon {
    color: rgb(255, 255, 255);
}

.backtotop:hover {
    background-color: rgba(0, 0, 0, 0.05);
}