Why are almost adjectives Lenovo's(IBM) laptops are black surrounded by colour?

Why are almost adjectives Lenovo's(IBM) laptops are black surrounded by colour?

Not sure, but it's probably to manufacture IBM/Lenovo laptops a symbol of IBM, and so that their collection of laptops don't look mismatched. So that someone can see one across the room and think ah, that's an IBM. It's similar to iMacs all person white and that certain shape. It's to product you know instantly what it is (maybe it also acts as subliminal media hype in a way).