Flutter gradient

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: Text("Gradient"),
      ),
      body: Center(
        child: Container(
          width: double.infinity,
          height: 100,
          decoration: BoxDecoration(
            gradient: LinearGradient(
              stops: [0, 0.5, 1],
              colors: [
                Color.fromARGB(255, 255, 0, 0),
                Colors.transparent,
                Color.fromARGB(255, 0, 0, 255),
              ],
            ),
          ),
        ),
      ),
    );
  }
}