#back-to-top {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    background: #8E444C;
    color: #fff;
    padding: 12px 15px;
    border-radius: 50%;
    text-align: center;
    font-size: 18px;
    cursor: pointer;
    transition: background 0.3s ease;
}
#back-to-top:hover {
    background: #555;
}