Hi, it's me again.
So my problem today is my background image for my wiki. I'd like to resize it but doing it on Paint is impossible and that's all I have. So I was wondering if I could resize it with MediaWiki:Wikia.css and how.
A preview of the problem: https://mechants-fr.fandom.com/fr/wiki/Wiki_M%C3%A9chants_Fr.
Thanks in advance.