Modifiing the MacOS X style

[OS]

Hello,

i have modified the MacOS X style into 1Bit black and white MacOS System 7.0 style.

(https://coppermine-gallery.com/forum/proxy.php?request=http%3A%2F%2Fmyoldmac.net%2Fcgi-data%2Fgal%2Falbums%2Fuserpics%2F10001%2Fthumb_hacker-sticker-mac-pirate.jpg&hash=5770771d351063740c068b80463e7d73132e4a80)

It works well, but I like to change the "color" for the background areas (left and right parts of page)
from white to black.

Please have a look to my Apple and Mac Picture Gallery at

http://myoldmac.net/cgi-data/gal/    (short, short... TranzNDance u understand  )

can you tell me in wich style template i have to change wich code? 

Also i like to change the color of the image areas in the album over view (index) pages,
when you look at the index page, the areas with the thumbs on it.

I like to change from white to a backgroundimage (like the one in the titles)

can you also tell me in wich style template i have to change wich code?