Hello,
I'm not sure if this is the right place to post it, sorry.
Some changes were added to Joplin in the past month that changed the style (colors, fonts, etc) of the Markdown editor (#5174 Codemirror theme update // #5314 Improved Markdown editor code styling // Added margin for readability, among other things).
In this attempt, I wrote some custom CSS put in the file userchrome.css that outclass the regular CSS, for the Light theme.
Here is what it look like:
On github:
Cheers,