x/playground: line numbers greater 9 are hidden on android mobile

[nightlyone]

Go version

latest

Output of go env in your module/workspace:

Does not apply 

Chrome version 120.0.6099.230
on Android Samsung A53

What did you do?

Open https://go.dev/play/p/wllkgRAtd4a on an android phone

What did you see happen?

Line numbers greater than 9 on the left are garbled

What did you expect to see?

Lines numbers greater than 9 should be readable.

[SoulPancake]

Is this specific to just androids or a specific resolution on responsive mode? @nightlyone

[Omkar76]

Played around this a bit in dev tools. seems like an easy fix with flexbox. Feel free to assign this to me.

[gopherbot]

Change https://go.dev/cl/558015 mentions this issue: go/playground: fix mobile UI bug, greater than 9 digits line number hidden bug in mobile devices