Help with my Random quote machine generater

Hi guys,
I am working on my random quote and when I click on the bottom to get a new quote it is not displaying my test quotes. I know the problem is in my JS but I can’t figure out what it is, and also my headings and quote box do not seem to be centered even though when I run the local files on my computer from my text editor and web browser they are.Can someone please help?

Thank you,

Thank you for your help, you help what I was doing wrong.