content: import 'package:flutter/material.dart';
  
  class FaceIdScreen extends StatefulWidget {
    const FaceIdScreen({Key? key}) : super(key: key);
  
    @override
    State<FaceIdScreen> createState() => _FaceIdScreenState();
  }
  
  class _FaceIdScreenState extends State<FaceIdScreen> {
    
    final Color _accentColor = Color(0xFF164CA2);
    
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        body: Stack(
          fit: StackFit.expand,
          children: [
            Container(
              height: double.infinity,
              width: double.infinity,
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  begin: FractionalOffset.topCenter,
                  end: FractionalOffset.bottomCenter,
                  colors: [
                    _accentColor.withOpacity(0.5),
                    _accentColor,
                  ],
                  stops: const [
                    0.0,
                    1.0,
                  ]
                ),
              ),
            ),
            Align(
              alignment: Alignment(0, -0.1),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Image.asset("assets/icons/face-id.png", width: 130.0),
                  const SizedBox(height: 20.0),
                  Text('Face ID for payment', style: TextStyle(fontSize: 17.0, fontWeight: FontWeight.w400, color: Colors.white)),
                  const SizedBox(height: 10.0),
                  Text('Use Face ID to unlock.', style: TextStyle(fontSize: 13.0, fontWeight: FontWeight.w400, color: Colors.grey[400])),
                ],
              ),
            ),
            Align(
              alignment: Alignment.bottomCenter,
              child: Container(
                height: 50.0,
                margin: EdgeInsets.only(bottom: 100.0, right: 40.0, left: 40.0),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.all(Radius.circular(10.0))
                ),
                child: Center(
                  child: Text('START SCAN', style: TextStyle(fontSize: 15.0, fontWeight: FontWeight.w700, color: Colors.black)),
                ),
              ),
            )
          ],
        ),
      );
    }
  }
  