special shadow question

hi there,
i'm trynig to create a drop shadow behind a table for a website. from the
other posts i learned, that this works with a backgrund image that tiles in
y-direction.
my problem is that this tiling won't work, because the backgrojund behind the
shadow should be two colored. At the above section orange and below grey.
so have you an idea to solve this?

URL?

--
Regards

John Waller

sorry i don't have a url yet. it should look similar like www.spreeblick.de but
the grey background should be two coloured.
the background should follow the structure of the content:
where the header is it should be green and below i want to leave it as grey.

ok URL is: https://www.bloghof.net/Daenz

you see there are many problems.
i don't get the content in between the shadow images,
and there are slight spaces everywhere between the divs.
Does somebody know how to order that, so that the whole content is centered?
Maybe a hint how you should order div's or which system to put them into.