How do I complete my "if" statement?

Question

I was trying to make so that if the id of main is displayed when the button is clicked, then it disappears. I keep getting an error. I don't know why.
https://code.sololearn.com/W519SE7S5zgt/?ref=app

Answer 1

you mean like this
https://code.sololearn.com/WxVUrujJ5Z26/?ref=app