.back-to-top {
    position: fixed;
    bottom: 10%;
    right: 0px;
    text-decoration: none;
    color: #FFFFFF;
    font-size: 12px;
    padding: 1em;
    display: none;
    font-weight: bold;
    background-color: #7f345a;
}

    .back-to-top:hover {
        background-color: rgb(0, 102, 153);
        text-decoration: none;
        color: #FFFFFF;
    }