only some pages centered

I’m sure this will be extremely easy to fix, but for some reason I am having a ton of trouble.

Our main landing page is centered perfectly and how I want all my pages, but if you go to any other page they pull left and there is no left margin. I’m not sure where I messed this up but I would appreciate any help in the matter.

I understand that I have asked about this before, however I am not sure how one page is centered and no other ones are and I don’t know if I messed up the code in my child sheet.

Thanks!

galavantingtomarvel.com