How To Add Background Gradient In Bottom Navigation bar Flutter

dependencies:
  flutter:
    sdk: flutter
  gradient_bottom_navigation_bar: ^1.0.0+4

flutter pub get

import 'package:gradient_bottom_navigation_bar/gradient_bottom_navigation_bar.dart';

bottomNavigationBar: GradientBottomNavigationBar(
  backgroundColorStart: Colors.red,
  backgroundColorEnd: Colors.purple,
  items: <BottomNavigationBarItem>[
    BottomNavigationBarItem(icon: Icon(Icons.message), title: Text('Message')),
    BottomNavigationBarItem(icon: Icon(Icons.settings), title: Text('Setting')),
    BottomNavigationBarItem(icon: Icon(Icons.mail_outline), title: Text('Mail')),
  ],
  onTap: (index) {
    //Handle button tap
  },
),

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


void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'App Design',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);


  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: Text(' Gradiant Background'),
        backgroundColor: Colors.purple,
      ),
      body: Center(
        child: Text('Welcome BajarangiSoft'),
      ),
      bottomNavigationBar: GradientBottomNavigationBar(
        backgroundColorStart: Colors.red,
        backgroundColorEnd: Colors.purple,
        items: <BottomNavigationBarItem>[
          BottomNavigationBarItem(icon: Icon(Icons.message), title: Text('Message')),
          BottomNavigationBarItem(icon: Icon(Icons.settings), title: Text('Setting')),
          BottomNavigationBarItem(icon: Icon(Icons.mail_outline), title: Text('Mail')),
        ],
        onTap: (index) {
          //Handle button tap
        },
      ),
    );
  }
}