Feedback wanted: Wiki viewer

Hi,

I’m looking for some feedback on my wiki viewer .

  1. I had some remarks about my spaghetti code in my previous project (Random Quote).
    But i feel i learned something more about callback functions, which makes my currect javascript code more readable (in my opinion).
    Does someone care to check it out - give feedback what i still do wrong or could be better?

  2. Maybe it needs a little more finishing touch, maybe some kind of animation, but i don’t really feel like practicing that right now.
    Still made it responsive and rather clean/simple looking.

Ok but when you click for the random article the completed sollution offered by freecodecamp
opens a new Tab or Window for the wikipedia article(fairly easy ok ok ). Other than that, the search works as expected