dart file where all project colors are declared

projectcolors.dart

import 'package:flutter/material.dart';

Color mainColor = Color(0xff662D6C); // main app primary color or brand color
Color errorTextColor = Colors.red; // color for error text
Color grey = Colors.grey;
Color whiteBG =  Colors.white;
Color textFieldBorderColor = Color(0xffb0018a); // color for textfield borders

// 102, 45, 108 is the RGB variant of #662D6C
Map<int, Color> cColor = {
  50: Color.fromRGBO(102, 45, 108, .1),
  100: Color.fromRGBO(102, 45, 108, .2),
  200: Color.fromRGBO(102, 45, 108, .3),
  300: Color.fromRGBO(102, 45, 108, .4),
  400: Color.fromRGBO(102, 45, 108, .5),
  500: Color.fromRGBO(102, 45, 108, .6),
  600: Color.fromRGBO(102, 45, 108, .7),
  700: Color.fromRGBO(102, 45, 108, .8),
  800: Color.fromRGBO(102, 45, 108, .9),
  900: Color.fromRGBO(102, 45, 108, 1),
};

// materialcolor derived from the app primary color
MaterialColor materialMainColor = MaterialColor(mainColor, cColor);