Playground styling for small screens

[craigfrancis]

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With https://pyre-check.org/play, the styling is a bit wrong for small screens (e.g. mobile phones)... which makes it impossible to see the code editor.

It seems to happen because the <main> element has a margin-left of 300px.

I wonder if the class is wrong. Rather than using .main (or .main_MeqP after preprocessing), I suspect it should be .playgroundMain (or .playgroundMain_uARe after preprocessing), ref styles.module.css, then compare pysa-playground.js and play.js