Hi Guys
Another approach is to use white acrylic and paint it with either a Matt Black or Satin black. Some piccies here
https://forums.eagle.ru/showthread.php?t=107808&page=12
I used three layers, the bottom used black acrylic with both switches and backlighting leds mounted on it, middle is a spacer for hiding the switch nuts along with holes for the led lighting to pass, and then the top layer is white acrylic.
What was a little interesting was the experience of different paint manufacturers, the cheaper ones did not come up as well as a good quality quick dry.
Cheers
Peter