i really do love the new addition to customize the background colour on the profile:
https://forums.d2jsp.org/topic.php?t=69799421&f=258

makes the profile page look super neat!
though i think it would be really nice to have this option for all pages on d2jsp. what do you guys think? i would totally love this

Definitely would like it. It would make everything look wicked clean. You have my vote

Everything outside the profile as far as background will be part of the style, this will not be changing.