fkutter Stepper step indicator

Material Design a step indicator that shows the process sequence of steps

import 'package:flutter/material.dart';

class StepperDemo extends StatefulWidget {
  @override
  _StepperDemoState createState() => _StepperDemoState();
}

class _StepperDemoState extends State<StepperDemo> {

  int _currentStep = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('StepperDemo'),
        elevation: 0.0,
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Theme(
              data: Theme.of(context).copyWith(
                primaryColor: Colors.black,
              ),
              child: Stepper(
                currentStep: _currentStep,
                onStepTapped: (int value) {
                  setState(() {
                    _currentStep = value;
                  });
                },
                onStepContinue: () {
                  setState(() {
                    _currentStep < 2 ? _currentStep += 1 : _currentStep = 0;
                  });
                },
                onStepCancel: () {
                  setState(() {
                    _currentStep > 0 ? _currentStep -= 1 : _currentStep = 0;
                  });
                },
                steps: [
                  Step(
                    title: Text('Login'),
                    subtitle: Text('Login first'),
                    content: Text('Magna exercitation duis non sint eu nostrud.'),
                    isActive: _currentStep == 0,
                  ), 
                  Step ( 
                    Title: ( "Choose Plan" ), 
                    subtitle: Text ( "Choose you plan." ) 
                    Content: text ( "Great exercise, homework will not be nostrud football. ' ) 
                    IsActive: _currentStep == 1 , 
                  ) , 
                  Step ( 
                    Title: ( 'Confirm payment " ), 
                    subtitle: Text ( " Confirm your payment method. " ) 
                    content: text (),"Great exercise, homework will not be nostrud football." 
                    isActive: _currentStep == 2 , 
                  ), 
                ], 
              ) 
            ) 
          ] 
        ) 
      ) 
    ); 
  } 
}

effect: