.ad-popup {
    width: 90vw;
    max-width: 400px;
    height: auto;
    max-height: 90vh;
    position: relative;
    overflow: hidden;
}

@media (max-width: 600px) {
    .ad-popup {
        width: 95vw;
        max-width: 95vw;
        height: auto;
        max-height: 95vh;
    }
}