Toggling between dark, light and system

Hi everyone, I’m a bit of a newbie when it comes to HTML/CSS/JS etc., and I wanted some basic help. I’ve managed successfully to customise a blockquote on my theme for both light and dark mode. But where I’m struggling is with “system”, when it is dark. It seems to take some elements from my light mode and dark mode, ending up with a sub-optimal display.

I’m using the Dawn theme that I bought from IVEEL before acquisition :slight_smile: