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HTML Embed Youtube API mobile & desktop responsiveness [please help]

Hi i’m trying to make my youtube API embed responsive on desktop and mobile but can’t seem to figure out how to make it work.

Here is my site Read-Only: https://preview.webflow.com/preview/chases-supercool-project-f278b6?utm_medium=preview_link&utm_source=designer&utm_content=chases-supercool-project-f278b6&preview=c2187ef3449abc5a12eddb9b4184e726&pageId=5f90aaf901939082cd0dbc50&mode=preview