Problems with responsiveness

Hey guys

I have a big problem with my Wix test page (working on it as a test before I build a real page). URL is this https://u2karta.wixsite.com/mysite (is just a regular theme) and even I sign up for mobile view, however I approach part of the screen just gets cut off (as it is not being responsive). Is there some way to make it responsive?

Thanks!