Please make the mouse button placeholders black with gray boundary

[raindropsfromsky]

I have already filed request #3 to change the display to OSD (On-Screen Display) or HUD (=Heads Up Display).

But if that's not possible due to coding (or time) constraints, then can you please redesign the three rectangles that represent the mouse buttons?

The idea is to make it more evident when the button is pressed.

Currently the blocks are gray, which become white when the button is pressed. The difference is not much. So if the blocks are made black (with gray outline), the block color would change from black to white when a button is pressed; which is quickly noticeable.

[jayanam]

Will make the colors configurable