【Flutter】AspectRatioの使い方｜縦幅・横幅をアスペクト比(比率)で表示

AspectRatio(
  aspectRatio: 5 / 2,
  child: Container(
    color: Colors.blue,
  ),
),

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Flutter')),
        body: Center(
          child: AspectRatio(
            aspectRatio: 5 / 2,
            child: Container(
              color: Colors.blue,
            ),
          ),
        ),
      ),
    );
  }
}