Today I'm seeing Bitbucket.org is rendering code blocks in red. This wasn't the case until the last days I think. The red lines are difficult to read.
See the attached example.
How to revert to the modest grey?
I have the same issue!
But I noticed the red text (CSS class `err`) only appears for code blocks that do not have a language specifier, for example this displays some json with correct syntax highlighting:
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