Board Thread:Support Requests - Designing Your Wiki/@comment-39954525-20191013184948/@comment-43517768-20191015015405

I'd normally use :root instead of .body for the variable declaration, but I've never tried to use it on fandom--it's entirely possible it doesn't pass it through since it doesn't understand it. If you're using Chrome you can inspect the element to see if it was passed through. If you tried too soon, I've found it can take up to 10 minutes for fandom to actually apply the new CSS, then  will work.

I frequently copy and paste this stuff into notepad++, do a search and replace there, then copy and paste it back--just make sure you have it set to replace tabs with spaces--it still works if you don't, but it looks wrong.

If you post the wiki name, people can provide more help by looking at the wiki itself.