[racket] Getting the old scribble css style in Racket 6.0

Hi all,

I recently installed DrRacket 6.0, and I am now doing some scribbling work.
However when I run scribble --html foo.scrbl I am getting the old css
instead of the newest one...

More strangely, when I install a package the documentation is "scribbled",
and the resulting files use the new style. So I'm a bit puzzled...

Any hints would be appreciated

Thanks!
-- 
Ismael
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