CSS redirect

I transferred my wordpress from a subdomain to the main.
The plugin works but the css link is still the subdomain link so now it’s plain html. I don’t wonna reinstall because there’s already a lot of calendar input.

How can i set my css location to the new one?

http://wordpress.scoutslint.be -> http://scoutslint.be

https://wordpress.org/plugins/all-in-one-event-calendar/