We should have consistent side margins throughout the app except where there's a good reason to differ. I'm thinking we can make a constant for side margin size, apply it to theHeader component, and create a component to wrap page content that also uses it (or use it as a reused style object).

In v1, we have side padding of 50px or 20px depending on screen size, plus auto margins added to a max width of 1380. The Admin and Account pages are exceptions, and the navbar does its own thing (no auto margins).