#whatsapp-footer-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 999;
}

#whatsapp-footer-button a {
    display: block;
    width: 50px;
    height: 50px;
}

#whatsapp-footer-button img {
    width: 100%;
    height: 100%;
}