import 'package:shimmer/shimmer.dart';

SizedBox(
  width: 200.0,
  height: 100.0,
  child: Shimmer.fromColors(
    baseColor: Colors.red,
    highlightColor: Colors.yellow,
    child: Text(
      'Shimmer',
      textAlign: TextAlign.center,
      style: TextStyle(
        fontSize: 40.0,
        fontWeight:
        FontWeight.bold,
      ),
    ),
  ),
);

Credit (github url) : https://github.com/hnvn/flutter_shimmer

Next Article : https://flutterappdev.com/2019/01/07/the-game-of-fifteen-written-with-flutter/