Add an extra tap region to button widgets

@override
Widget build(BuildContext context) {
  return DeferredPointerHandler(
    child: Scaffold(
      body: Center(
        child: ExtraTapRegion(
          margin: 16.0,
          onPressed: _onPressed,
          child: ElevatedButton(
            onPressed: _onPressed,
            child: const Text('Hello'),
          ),
        ),
      ),
    ),
  );
}

void _onPressed() {}