If that works for your project in all screen sizes then that’s good. We can’t really provide specific custom coding advice or provide custom coding support in general.
I just like to add here that our X or the Original Footer is already centered and its contents contained based on the Site Max Width option out of the box. If that is no working on your end, a custom code your added to your site might be causing the issue so if this is the case, you need to inspect all your custom CSS.
If custom coding is not feasible for you, I’d recommend you upgrade to Pro so you’ll have a Footer Builder and we’ll help you if you get stuck with the Pro Footer setup.
If upgrading to Pro is not what you want, you need to learn more CSS and also learn how to use the browser’s element inspector. If you get stuck with custom coding though, you’d need to consult with a 3rd party developer.
Thanks for understanding.