WordPress 6.9 and button agyle change

Hello dear Elearning..

I am using Eduhub template,imported by Masteriyo templates.

WordPress was updated automatically few days ago to V6.9 and after the update, the “learn more” button color in the Hero section of Eduhub changed and became fill blue. It was outline blue before the update.

I tried to Edit it by Gutenberg editor, but the colors didn’t change. Maybe a css should change.

the template is https://themegrilldemos.com/elearning-eduhub-gutenberg/

but on wordpress 6.9 the right button color changes

and there are always three css codes there in the additional ccs for this theme.

Could you please tell me how to make it like before?

thanks