#hungvuCheckoutModal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.checkout-modal-inner {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    max-width: 700px;
    width: 100%;
    overflow-y: auto;
    max-height: 90vh;
    position: relative;
}
.hidden {
    display: none;
}