few cosmetic fixes

Hello,
for my forum: interfans.org/forum I need some fixes

1. adv banner problem
2. change avatar size per specific group
3. change node forums background
4. add a background image in the header
5. user banner styling
6. fix on/off forum icon
7. change color of a header tab menu...

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source https://xfworld.net/threads/few-cosmetic-fixes.47971/