How to add "feedback" floating button like this site

It says:
Paste the Hotjar code into the <head> of every page you wish to track visitors and collect feedback. And then verify your installation.

I pasted in head section after going to edit css/html option in settings. It is not working

Edit:
I created new component. I named it “feedback”. Pasted the code in common/head section.Add the component to my current theme. did a refresh. cannot see it