Which CSS file should I edit?

Hey there Kettercat,

Hope you’re well today!

You should never edit theme core files since all changes you make will be lost once you update the theme and you can’t really keep track of the modifications you make.

You should either add code in the style.css file of your child theme or add it in your site using custom CSS plugin such as this one:

http://wordpress.org/plugins/simple-custom-css

Hope this helps 🙂

Cheers,
Bojan

Glad I could help 🙂

Cheers,
Bojan