Unify looks with odoc output

[XVilka]

Odoc is a documentation generator for OCaml. It reads doc comments , delimited with (** ... *), and outputs HTML. Since 1.4.0 version it generates nice and shiny output like that:

I think it might be beneficial to unify the hevea output, which also is a generator of HTML version of OCaml manual, with odoc looks.

[pmetzger]

What exactly are you proposing, though? As it stands, it isn't clear what sort of changes you want to hevea. Maybe you could propose a pull request?