Flutter -如何创建圆形背景颜色？

Container(
  width: 100, // 设置容器的宽度
  height: 100, // 设置容器的高度
  decoration: BoxDecoration(
    shape: BoxShape.circle, // 设置形状为圆形
    color: Colors.blue, // 设置背景颜色为蓝色
  ),
)

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Circle Background'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Container(
                width: 100,
                height: 100,
                decoration: BoxDecoration(
                  shape: BoxShape.circle,
                  color: Colors.blue,
                ),
              ),
              SizedBox(height: 20),
              Text(
                'Circle Background',
                style: TextStyle(fontSize: 20),
              ),
            ],
          ),
        ),
      ),
    );
  }
}