Code blocks have unnecessary scroll bars

[jsha]

The code blocks on our site always have horizontal scroll bars, even when those are not necessary. See, for instance, this screenshot from https://letsencrypt.org/docs/revoking/:

It seems like the overflow-x: scroll in src/css/_base.scss has something to do with this, but I'm leery of removing that entirely. I'd like scrollbars to appear when they are needed, but with the current CSS, it seems like browsers (Chrome at least) are concluding the scroll is always needed.

[tdelmas]

Yes, cf #757 (review)

[jsha]

Oh, nice, I didn't realize overflow-x: auto was different than the default! TIL.