What color are stratus clouds?

Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals. More specifically, the term stratus is used to describe flat, hazy, featureless clouds of low altitude varying in color from dark gray to nearly white. read more

A stratus cloud is simply a cloud that results from a thermal inversion. It is rather flat and doesn’t have a special color. It's mainly appear as nearly white in colour , if the cloud is layered, just like stratus cloud in lower level clouds but dark in colour it'll be nimbostratus cloud (rainy layered clouds ). read more