Unknown error

Question

Can someone help explain what's wrong here. It doesn't append to the target element.

https://code.sololearn.com/W71P1fwc9rWf/?ref=app

Answer 1

you're forget to add an id attribute to the div element:
https://code.sololearn.com/Whc6c3qQdu6l/#html

Answer 2

Yeah. I later realize that. I was using nth-of-type instead of ID's