body {
    position: relative;
}

.whatsapp-button {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 1000;
}

.whatsapp-button img {
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
}