iFrame in Editor X

Hi everyone,

I’m trying to design an iFrame embedding a video from Youtube (I need it with no-cookie).
The embedded code is working well, and I’ve customized it to fit 100% in width and height.
The problem is the iFrame itself. I would like it to scale when the screen resize, keeping its size to perfectly fit the video content, but I can’t manage. It seems not possible.
Any help?

Thanks a lot.

Riccardo