#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    background-color: #f0f0f0;
    color: #333;
    border: none;
    padding: 10px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

#back-to-top:hover {
    background-color: #e0e0e0;
}