#nachOben {
    position: fixed;
    right: 25px;
    bottom: 25px;
    border: none;
    background: transparent;
    color: #333;
    font-size: 38px;
    font-weight: bold;
    cursor: pointer;
    display: none;
    z-index: 9999;
    transition: transform 0.25s, color 0.25s;
}

#nachOben:hover {
    color: #111;
    transform: translateY(-5px);
}