Should notification be constrained by max-width?

[anselmbradford]

cf-layout adds a default max-width for a number of elements that appear under its purview.
Regs3k has a full-width-text molecule mixed in with a notification for the purpose of adding this same max-width.
Should we add that max-width as a default behavior for notifications here and remove the mixed in class in cfgov-refresh?

[Scotchester]

I think this is a reasonable idea. In a bordered/backgrounded box context like notifications, having the box go all the way across but the paragraph be width constrained looks a bit odd.