Hello, help me with my code please. Everything is correct in it, but for some reason it does not work

Question

https://code.sololearn.com/Wfjnh8uCUkFH/?ref=app

Answer 1

Wrap your code inside window.onload event handler function
window.onload=function(){

//Your js code here or the one that is selecting the dom elements

}

Answer 2

THANKEE!