video covers right column in Brave and Duck Duck Go

We have a site with a large left column and a smaller right column

I am using the responsive setting because I want the videos to adjust to different size screens, but in Brave and Duck Duck Go browsers they don’t end at the side of the larger column, they cover the right column as well.

There is an image here: https://app.screencast.com/C61FbAnT3Wm7q

The page I need help with: [log in to see the link]