Get JS output in HTML after pressing a button

I am building my random quote machine and I can get JS to work as I want.
I want, after pressing a button (which is actually a div inside a tags) to run a specific JS function and then get the output of that function in the quote div, how is that possible? I have tried different things so far but nothing works as I want, thanks!!
https://codepen.io/dimitris51/pen/GxOVbX