Need help with Random Quote Machine - JQuery

Hello, I need some help with this project. It seems that jqery is not working, but I don’t why.
This is my project.
I added jquery libraries, but when I click on the button, nothing happens.
Any help?

I can give a hint.
what “prefix” do you use to call a get a class in jquery ?

Thank you, I found it.
I spent 2 days and I was pretty sure that the all the prefix were correct… but sometimes you got blind in front the code.