#go-to-top {
    position: fixed;
    right: 0.5em;
    bottom: 0.5em;
    display: none;
    font-size: 18px;
    text-decoration: none;
    background: #000;
    color: #fff;
    padding: 10px 15px;
    border-radius: 50%;
    text-align: center;
    cursor: pointer;
    z-index: 9999;
    transition: background 0.3s ease;
}

#go-to-top:hover {
    background: #666;
}