These are SASS and card format HTML files that I use for my Russian language study deck in Anki. Since I have multiple note types with both common and different features, I generate the CSS from SASS before pasting into the Anki card template editor.
An example of the type of formatting that you can apply in Anki (light solarized theme):
If you're interested in how all this gets integrated into the cards in my deck, you can import the .apkg file into Anki.