[racket] Best way to propose changes to Scribble CSS files

I'm glad this has made it into the pre-release docs now. I use it for my
daily documentation browsing and it's great!

I noticed one small regression though, which is that certain inset "blue
boxes" that are used for examples of notation or documentation forms are
no longer displayed inset (and in some cases with slightly odd spacing).

Here are two examples:
  http://www.cs.utah.edu/plt/snapshots/current/doc/reference/notation.html
  http://pre.racket-lang.org/docs/html/reference/notation.html

  http://www.cs.utah.edu/plt/snapshots/current/doc/scribble/doc-forms.html
  (look for "Renders like:")

These are both cases that used @nested[#:style 'inset ...].

Cheers,
Asumu