.whatsapp-buy-btn {
    display: inline-block;
    background-color: #25D366;
    color: #fff;
    padding: 12px 20px;
    font-weight: bold;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 0 0 rgba(37, 211, 102, 0.4);
    animation: pulse 2s infinite;
    transition: all 0.3s ease-in-out;
    font-size: 16px;
}
.whatsapp-buy-btn:hover {
    box-shadow: 0 0 15px rgba(37, 211, 102, 0.8);
    transform: scale(1.05);
}
.whatsapp-buy-btn i {
    margin-right: 8px;
}
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}