Center text in parallax widget on front page

My website is

When I decrease font size on front page parallax widgets, text gets aligned to the left. Also shorter text gets aligned to the left. How to change that?

Hello there,

I hope you are doing well today.

Have you added any new CS code to the theme? If so, what was added?

Best Regards,

I haven’t added any new CS code. I just decreased the font size within existing custom CSS. When the font size is large is centers properly. Check attached screenshots for different font sizes.