#btnBackToTop {
    display: none; /* Hidden by default */
    position: fixed; /* Fixed/sticky position */
    bottom: 20px; /* Place the button at the bottom of the page */
    right: 30px; /* Place the button 30px from the right */
    z-index: 99; /* Make sure it does not overlap */
    border: none; /* Remove borders */
    outline: none; /* Remove outline */

    cursor: pointer; /* Add a mouse pointer on hover */

    background-color: transparent;
    border: 0;
    width: 3rem;
}

@media screen and (max-width: 768px) {
    #btnBackToTop {
        width: 4rem;
        right: 20px;
    }
}

@media screen and (max-width: 576px) {
    #btnBackToTop {
        width: 4rem;
        right: 10px;
    }
}