Cupertino Icons

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ConstrainedBox(
      key: UniqueKey(),
      constraints: BoxConstraints.tight(const Size(200.0, 100.0)),
      child: Container(
        padding: const EdgeInsets.all(5.0),
        color: Colors.white,
        child: Center(
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: const <Widget>[
              Icon(
                CupertinoIcons.heart_fill,
                color: Colors.pink,
                size: 24.0,
              ),
              Icon(
                CupertinoIcons.bell_fill,
                color: Colors.green,
                size: 30.0,
              ),
              Icon(
                CupertinoIcons.umbrella_fill,
                color: Colors.blue,
                size: 36.0,
              ),
            ],
          ),
        ),
      ),
    );
  }
}