[Users] Background colour of message view window

[Marco]

2012-09-17 wwp <subscript at free.fr>:

Hi wwp

> > is it possible to change the background colour of the message view
> > window?
> 
> I'm not sure it's possible to change only the message view background
> color (can't remember, too lazy to check), but such color changes
> happend by modifying the GTK+-2 theme, either at desktop-level or in
> ~/.claws-mail/gtkrc-2.0

This file is not present on my system. I assume that I have to
create it. I googled a bit for the syntax of this file, but I have
no clue what to do to get the message view window background in, say
light gray.

Marco