AppBar Color

main.dart

import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        theme: ThemeData(
          brightness: Brightness.light,
          useMaterial3: true,
          colorScheme: ColorScheme.fromSwatch(
            primarySwatch: Colors.blue,
          ).copyWith(
            primary: Colors.pink,
          ),
        ),
        debugShowCheckedModeBanner: false,
        home: Scaffold(
          appBar: AppBar(),
          body: const SizedBox.shrink(),
        ),
      ),
    );