Screen border of black Gameboy light or dark grey?

Hi gents.
I'm having a dispute with someone and was hoping you guys could help.
The question is: Does the black Gameboy have a light grey screen border like the original grey dmg? Or does it have have a dark grey screen border like the other coloured dmgs?

I'd really appreciate any input given that you'll probably know.
Please answer with as much/any information you can.

Thanks.