How to get toddler to wear mask

my boy starting also dislike to wear mask. After started his playgroup. teacher start to train him wear mask. now he at school wear at home don't like to wear too but we have to tell him now there's a virus out there everybody have to wear if u don't wear u cannot go out. actually now he wear mask also not correct. not pushing up to his nose area but at least he wear it when outside.