Random Quote API CodePen problem

I have a problem with running my code on CodePen. I wrote code in atom, run it with chrome, and it worked fine. Than try the same code in CodePen and code does not work =(.
There is a link to my Codepen:RandomQuote

change your API url to use https instead of http, you are having mixed content issues (also look at your console.log for errors in the future)

Thanks alot for quick replay. I will use your advice in the fututre.