import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Color Simulation',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  double _value = 0.5;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: SizedBox(
        width: MediaQuery.of(context).size.width,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Container(
              height: 44,
              width: 200,
              alignment: Alignment.centerLeft,
              child: Stack(
                alignment: Alignment.centerLeft,
                children: [
                  Container(
                    height: 4,
                    decoration: BoxDecoration(
                      gradient: LinearGradient(colors: [
                        Colors.red,
                        Colors.blue,
                      ]),
                      borderRadius: BorderRadius.circular(2),
                    ),
                  ),
                  SliderTheme(
                    data: SliderThemeData(
                      trackHeight: 44,
                      thumbColor: Colors.white,
                      activeTrackColor: Colors.transparent,
                      inactiveTrackColor: Colors.transparent,
                      thumbShape: RoundSliderThumbShape(
                        enabledThumbRadius: 12,
                        elevation: 4,
                      ),
                      overlayShape: RoundSliderOverlayShape(
                        overlayRadius: 24,
                      ),
                    ),
                    child: Slider(
                      value: _value,
                      onChanged: (newValue) {
                        setState(() {
                          _value = newValue;
                        });
                      },
                    ),
                  ),
                ],
              ),
            ),
            SizedBox(
              width: 50,
              child: Text(
                '${(_value * 100).round()}%',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 16,
                ),
                textAlign: TextAlign.end,
              ),
            )
          ],
        ),
      ),
    );
  }
}