How about some Wikipedia Viewer Feedback

Hi guys,
I wanted to finally post a project publicly to get some feedback on it. It’s the Wikipedia Viewer project. I’m comfortable (not confident) in the backend programming, but not so much with the design. I know I can resize things on click, but should I? I think it makes it a little more intuitive as to what’s happening, but does it really?

I’m keen to get feedback on any or all of it, and would certainly appreciate any thoughts or ideas you might have on it.

The project on CodePen

Thanks for taking the time.