#wcf-button {
    position: fixed;
    bottom: 20px;
    left: 20px;
    background-color: #25D366;
    color: white;
    padding: 12px 18px;
    border-radius: 50px;
    font-size: 16px;
    cursor: pointer;
    z-index: 9999;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}