.whatsapp-button {
    background-color: transparent;
    color: #25D366;
    padding: 10px 20px;
    border: 2px solid #25D366;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    margin-top:-25px;
}

.whatsapp-button:hover {
    background-color: #21b858;
    color: #fff;
}