This allows for up to 256 levels of each color component. For example, bright red is specified as CXFF0000, white as CXFFFFFF, black as CX000000 ... HSV, CMYK, or gray-scale color-naming schemes.
However, after receiving users’ feedback about the white UI in Office, Microsoft decided to introduce two new themes or color schemes in Office: Dark Gray, White, Gray, Colorful or Black.