Is there a fix with Wix Code for style discrepancies between Desktop and Mobile versions of Wix Events?

I am amazed and confounded as to why Wix does not differentiate between card background and app background in the Mobile Editor. I have called about it countless times but they have no interest in fixing this, it would seem. They suggested I look for a solution through Wix Code. I have limited experience, and from what I can tell so far, Wix Events cannot be styled via Wix Code. Please let me know if anyone can think up a solution! Here’s what I’m up against…