How can I fix overlapping elements in Dawn theme YouTube video iframe?

[CADbaristainst]

i followed instructions here: https://community.shopify.com/c/technical-q-a/youtube-embedded-videos-not-resizing-for-mobile-dawn-t... but now the page has elements overlapping. https://canadianbaristainstitute.com/blogs/video/working-as-a-team

Can someone recommend how to fix? thank you, Jamie