如何在flutter web中制作像这样的滚动背景动画？

import 'package:flutter/animation.dart';

class ScrollingBackground extends StatefulWidget {
  @override
  _ScrollingBackgroundState createState() => _ScrollingBackgroundState();
}

class _ScrollingBackgroundState extends State<ScrollingBackground>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: Duration(seconds: 10),
      vsync: this,
    )..repeat(reverse: true);
    _animation = Tween<double>(begin: 0, end: 1).animate(_controller);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animation,
      builder: (context, child) {
        return Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              colors: [
                Colors.blue.withOpacity(_animation.value),
                Colors.red.withOpacity(_animation.value),
              ],
            ),
          ),
        );
      },
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          ScrollingBackground(), // 添加滚动背景动画小部件
          // 其他内容
        ],
      ),
    );
  }
}