Color.fromHex constructor
      
      Color.fromHex({ 
    
- required String code,
Construct the color from a hex code string, of the format #RRGGBB.
Implementation
factory Color.fromHex({required String code}) {
  var str = code.substring(1, 7);
  var bigint = int.parse(str, radix: 16);
  final r = (bigint >> 16) & 255;
  final g = (bigint >> 8) & 255;
  final b = bigint & 255;
  final a = 255;
  return Color(r: r, g: g, b: b, a: a);
}