3D extrude and bevels problems

[#1]

Hello illustrator community, im recently exploring about illustrator's extrude and bevel feature. Well my problem is the color of the extruded area became black. Shouldn't it be a darker color ? or how can i change the color of the extruded area ? 

[#2 · Accepted solution]

You probably have a black stroke applied to the circle. Remove that and you should get a shade of dark blue.

Peter