Stubborn Meteor Video on Frontpage

Newbie here. I’ve read the instruction to guide posts. Please be kind.

The Problem:
This site https://www.tsatsatzu.com is running Responsive. It has a meteor video on the landing page. The video is ugly and won’t resize. And googling hasn’t been helpful.

Is there someplace on this forum that I haven’t found yet with instructions to help me whip that video into shape? To make it expand or contract (be Repsonsive!) according to the browser and device? To eliminate the strange undersizing seen in Mozilla, Chrome, etc?

And apologize in advance if this topic has been covered elsewhere. Newbie, right?

Thanks.