flutter: suffixIcon alignment

main.dart

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final textStyle = DefaultTextStyle.of(context).style;

    return SizedBox(
      width: 80,
      child: TextField(
        style: textStyle,
        decoration:
          InputDecoration(
            suffixIcon: Text('suffix', style: textStyle),
          ),
      ),
    );
  }
}