My site only works on Safari. Broken on Chrome / IE / Firefox [on hold]

Hello programmers / web designers,

My site has been working flawlessly for some time and now all of a sudden it is broken on Chrome / IE / and firefox. It looks perfectly fine on Safari.

I am desperate for help as my business is now suffering because of it. It is a shopify site with the stock shopify theme Launchpad that I heavily edited myself. I am not the best developer and my code is kind of messy.