preset6.html

<html>
<body>
<iframe width="100%" height="100%" src="https://www.youtube.com/embed/f0l7vmoI3KM?autoplay=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen autoplay></iframe>
<iframe width="100%" height="100%" src="humanoids.html" allowtransparency="true" style=position:absolute;z-index:10;top:0;left:0;"></iframe>
</body>
</html>