DynamicColor to use on DarkMode. More about: https://stackoverflow.com/posts/62062967/revisions

dynamic_color_extension.dart

extension DynamicColor on BuildContext {
  Color dynamicColor({int light, int dark}) {
    return (Theme.of(this).brightness == Brightness.light)
        ? Color(light)
        : Color(dark);
  }

  /// the white background
Color get backgroundColor =>
      dynamicColor(light: 0xFFFFFFFF, dark: 0xFF222A2E);
}

//How Implement

// import 'package:flutter/material.dart';
// import 'buildcontext_extension.dart';

// class Test extends StatelessWidget {
//   @override
//   Widget build(BuildContext context) {
//     return Container(
//       color: context.backgroundColor,
//     );
//   }
// }