Sorry when I open issues in this repo. Because, I can't see issues on your fork repo(Flutter-Neumorphic). You pushed new commit but it make bug.
Error msg: lib/src/colors.dart:88:33: Error: The getter a is not defined for the class Color.
My solution:
static Color _applyPercentageOnOpacity( {required Color maxColor, required double percent}) { final maxOpacity = maxColor.opacity; final maxIntensity = Neumorphic.MAX_INTENSITY; final newOpacity = percent * maxOpacity / maxIntensity; final newColor = maxColor.withOpacity(newOpacity); //<-- intensity act on opacity; return newColor; }