How can I center the my overall form?

I'm wondering where the settings are to center my overall form I just created (Food Scale) without changing the settings on the other forms.  I found how to center the headers, but the input tables look weird because they are off to the left. 

Thanks.

Kristy

It has to be done with Custom CSS codes. But that is our standard form format. The labels can either be on top, left or right, so how about moving the labels to left? Otherwise, let us know and we are more than happy to give you the correct CSS to adjust the layout.