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class MainPage extends StatelessWidget {
  const MainPage({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
      body: Container(
          height: double.infinity,
          width: double.infinity,
          color: Colors.yellow,
          child: Column(
            children: [
              TextField(),
              TextField(),
              TextField(),
              TextButton(onPressed: () {}, child: Text("送出"))
            ],
          )),
    ));
  }
}

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import 'package:flutter/material.dart';

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

class MainPage extends StatelessWidget {
  const MainPage({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: Scaffold(
      body: Container(
          padding: EdgeInsets.all(20.0),
          height: double.infinity,
          width: double.infinity,
          color: Colors.yellow,
          child: Column(
            children: [
              TextField(
                  decoration: InputDecoration(
                      contentPadding: EdgeInsets.only(left: 20.0, right: 10),
                      hintText: "請輸入姓名",
                      fillColor: Colors.grey,
                      filled: true,
                      border: OutlineInputBorder(
                          borderSide: BorderSide.none,
                          borderRadius: BorderRadius.circular(10.0)))),
              TextButton(onPressed: () {}, child: Text("送出"))
            ],
          )),
    ));
  }
}