Why is javascript not working outside of codepen.io?

Question

JavaScript

I can’t understand why the code doesn’t work (
Here is the project on codepen
https://codepen.io/chaly7500/pen/OvVBYv
And here is already on the html page
https://ad-rocket.com.ua/testcard/test.html
Code one and the same but the animation doesn't work
Maybe I'm somehow not connecting JS correctly?

Answer 1

try connecting the script in the footer, not in the header