#return-to-top {
    position: fixed;
    bottom: 100px; /* Positioned higher than the default chatbot which is at bottom: 20px */
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    width: 50px;
    height: 50px;
    display: none;
    text-decoration: none;
    border-radius: 50%;
    transition: all 0.3s ease;
    z-index: 1000;  /* Lower than chatbot's z-index of 9999 */
}

#return-to-top i {
    color: #fff;
    margin: 0;
    position: relative;
    left: 16px;
    top: 13px;
    font-size: 19px;
    transition: all 0.3s ease;
}

#return-to-top:hover {
    background: rgba(0, 0, 0, 0.9);
}

#return-to-top:hover i {
    color: #fff;
    top: 5px;
}