Possible tint on button

[kier70]

I have an example built using the interface builder which is set to display on top of another view.

When the view background color is #95c11f and the button circle is also set to the same it results in a slight difference in color on overlay. Am I missing a tint that I need to remove/ set to clear?

let circle = Shape( form: Circle(r: 55.0), fill: Color (val: 0x95c11f) )