.whatsapp-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    background-color: #25D366;
    border-radius: 50%;
    padding: 12px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: transform 0.2s;
}
.whatsapp-button:hover {
    transform: scale(1.1);
}
.whatsapp-button img {
    width: 32px;
    height: 32px;
}
@media screen and (max-width: 600px) {
    .whatsapp-button {
        padding: 10px;
    }
    .whatsapp-button img {
        width: 28px;
        height: 28px;
    }
}