My second item div is not display in border and haven't backgroundColor. Thanks you sir.

Question

display grid template columns item second in border.
https://code.sololearn.com/WdBXYiWele7i/?ref=app

Answer 1

I think you accidentally typed an equals sign on this line:
division.classList.add = ("grid-item");
Tip: you are having some duplicated code there, its better if you make a function that adds an item to the grid and then call it multiple times