function resizeIframe() { const screenWidth = window.innerWidth; if (screenWidth < 480) { iframe.height = "3437px"; // Mobile max-height } else if (screenWidth < 720) { iframe.height = "3300x"; } else if (screenWidth < 996) { iframe.height = "2858px"; // Tablet max-height } else { iframe.height = "2395px"; // Desktop max-height } } Here is the full iframe code: