#ww-whatsapp-btn {
    transition: box-shadow 0.2s, background 0.2s;
}
#ww-whatsapp-btn:hover, #ww-whatsapp-btn:focus {
    background: #128C7E;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
    text-decoration: none;
    outline: none;
}