Demo per Princess of Sky
<style>#SCcont7752{width: 100%;padding-top: 56.25%;position: relative;}#SCgFrame7752 {position: absolute;top: 0;left: 0;bottom: 0;right: 0;}</style> <div id="SCcont7752"> <iframe id="SCgFrame7752" frameborder="0" allowfullscreen="" mozallowfullscreen="" webkitallowfullscreen="" hspace="0" vspace="0" scrolling="none" src="https://slotcatalog.com/it/slots/Princess-of-Sky?ajax=1&blck=demo-widget" width="100%" height="100%"></iframe> </div>
copia