How can i remove the posts category class names from body_class

Question

I have 2 categories, just to make an easy example, Cars and Bikes. I have a post that fits both of the category. If i visit the Cars category, the body_class looks like this:

"archive category category-cars category-1 category-cars category-bikes"

The problem is that somehow the post category is visible in the body_class after the category-1 classname. How can i avoid this? I need to use different colors for different categories, but right now the category-bikes class overwrites the category-cars class.

Answer 1

This could be solved via CSS as well. Just set up declarations for the special cases where there is overlap between categories:

.category-cars { background-color: #f00; }
.category-bikes,
.category-cars.category-bikes { background-color: #0f0; }

This will give any posts that are in both bikes and cars the same background color as those used in the bikes category.