Help adding a new style/color palette

[NOIR-DexPrkr]

I want to create an extra color palette. Is it possible? Similar to .dark in the custom style.css
Why?
I want to have pages different color palettes depending on the path of my site.
Let's say

site/tutorials/ = blue color palette
site/news/ = gray color palette

How can I achieve something like this? If not by path, at least by specifying it on each .md frontmatter.

Thanks in advance.