Markdown: edit text formatting

Hello,
is there a way to edit text formats (font sizes, line pitch etc) for the md renderer?

I’m using NC 20.0.7
markdown editor (by Robin Appelman) 2.3.3
files are edited in qownnotes 21.1.3 and synced to the server.

Cheers,
Wolf

Anyone any ideas? Is it possible with custom css? The text size in the Text app is very small