.promo-banner {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 15px;
    font-size: 16px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    z-index: 9999;
}