Hey guys, As you've noticed fixing the bugs in Playground will be a lot of work. (And yes the graphql version conflict, line numbers, etc are bugs IMHO) and should probably be in their own ticket.

You can NOT fix these things with simple CSS changes. Playground does not use CSS in ways that we muggles understand. It uses react styled components. This means that if you want to fix these things you need to crack open playground-react and start sending patches upstream.