[imp] Changing IMP appearance

[r s]

Hi

I am tweaking with IMP's colours and appearance, but there is one setting i 
cannot find in
/var/www/html/horde/themes/mytheme/screen.css

It's the background colour of the selected module in the top bar.

For example if i choose email that button looks enabled and has an 
background colour, in this case blue (which is in the default theme). Which 
colour should be changed ?

TIA

/Rickard