Hard to tell selected classes for black and white colors

[amitkulk123]

The feature
When selecting pure black (#000) and pure white (#fff) colors, there isn't any contrast for the selected classes and so it's hard to tell when it's selected.

Detailed explanation
There needs to be some sort of contrast added so that it's easier to tell them visually apart.

Black (#000):

White (#fff):

Blue (which looks fine):