Board Thread:Support Requests - Designing Your Wiki/@comment-44523034-20200426172816

I am currently making a wiki for a game. I wanted to experiment with adding background images to things, but so far my attempts have been unsuccesful. I specifically want to add a background image to this template. I set up the mediawiki css here. My problem has been in actually using the css on the template. What code do I need on the template? 