This Github repository tracks a whole bunch of these drop-in CSS files: https://github.com/dohliam/dropin-minimal-css

And you can use this demo site to switch between them all on the fly: https://dohliam.github.io/dropin-minimal-css/

It's a shame how few of these prevent horizontal scroll on mobile. Usually the table and/or video are not probably handled. My take away from this: Simple does not mean easy; check edge cases.

It's a tricky problem. I've been battling with it on MVP.css (https://andybrewer.github.io/mvp/) but I think I found a good solution for responsive tables with some help from the community.

I'm also interested in your tables solution. Also, is there an organized MVP.css community somewhere?