Problem with Youtube video embeds resizing

Hi,

For youtube videos, I am having a problem where the video looks wider than the screen in mobile format.

I’ve tried adding columns to constraint the size so that the youtube video auto resizes on smaller screens but i still cannot resolve the problem. This error can be replicated on a mobile handphone browser.

I’ve also tried other video links and changing column sizes but it still doesn’t resolve the problem. Can you help?

the url is here: https://beyond4cs.com/color/how-well-can-you-see-diamond-color-differences/