What's the error in this code?

Question

https://sololearn.com/compiler-playground/WwqFjMHqcsSj/?ref=app

Answer 1

window.onload = () => {
Insert you entire js code
}
Or
In html code playground use <script></script> and insert your entire js code inside it.

Answer 2

also, the css looks bad on small phone screen...

Answer 3

kratinan singh