Is it possible to make a black line when coloring the notes around them?

[darkijah]

When coloring the notes I would like to see a sharp black contrast so it 
is easy to see the note while having colors in the bubble. I will post a 
picture how this looks and works in another app where I have sorted out 
the correct colors of the rainbow so you know what I am talking about :)

It will come as fast as I can see this on my mobile.

There must be a way I am sure to do this, maybe changing the default 
notes or something might work as well and make them in colors. I guess 
that might be another way to do it?

Anyway I will let the picture speak for itself.

Dearly regards
- Darkijah who are full of ideas :)