.pwa-install-btn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    background: #6666CC;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
}

.pwa-install-btn.show {
    display: block;
}