How can I change the bottom color of my drawer?

I have created my drawer. I have put the list tiles in a container and set the color of my container to white but the bottom of drawer still shows black. The widget is put in a separate class. I want the whole drawer to white except the drawer header which is in yellow. How can I solve it. Here is code snippet: class NavigationDrawerWidget extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: Column(
         children: <Widget>[
           Container(
             width: double.infinity,
             padding: EdgeInsets.only(
               top: 50,
               bottom: 50,
             ),
             color: Colors.yellow,
             child: Center(
               child: Column(
                 children: [
                   Container(
                     width: 100,
                     height: 100,
                     decoration: BoxDecoration(
                       shape: BoxShape.circle,
                       image: DecorationImage(
                           image: AssetImage('images/profile.png'),
                       ),
                     ),
                   ),
                   SizedBox(
                     height: 20,
                   ),
                   Text(
                     'Usama Tahir',
                     style: TextStyle(
                       color: Colors.black,
                     ),
                   )
                 ],
               ),
             ),
           ),
           Container(
             // color: Colors.white,
             decoration: BoxDecoration(
               color: Colors.white,
             ),
             child: Column(
               children: [
                 ListTile(
                   leading: Icon(
                       Icons.person,
                     color: Colors.black,
                   ),
                   title: Text(
                     'Profile',
                     style: TextStyle(
                       color: Colors.black,
                     ),
                   ),
                   onTap: null,
                 ),
                 ListTile(
                   leading: Icon(
                     Icons.account_balance_outlined,
                     color: Colors.black,
                   ),
                   title: Text(
                     'Tansaction History',
                     style: TextStyle(
                       color: Colors.black,
                     ),
                   ),
                   onTap: null,
                 ),
                 ListTile(
                   leading: Icon(
                       Icons.password_outlined,
                     color: Colors.black,
                   ),
                   title: Text(
                     'Change Password',
                     style: TextStyle(
                       color: Colors.black,
                     ),
                   ),
                   onTap: null,
                 ),
                 ListTile(
                   leading: Icon(
                       Icons.settings_accessibility_outlined,
                     color: Colors.black,
                   ),
                   title: Text(
                     'Profile',
                     style: TextStyle(
                       color: Colors.black,
                     ),
                   ),
                   onTap: null,
                 ),
             

Expanded(
               child: Column(
                 mainAxisAlignment: MainAxisAlignment.end,
                 children: [
                   ListTile(
                     leading: Icon(
                         Icons.login_outlined,
                       color: Colors.black,
                     ),
                     title: Text(
                       'Logout',
                       style: TextStyle(
                         color: Colors.black,
                       ),
                     ),
                     onTap: () {
                       Navigator.push(context,
                           MaterialPageRoute(builder: (context) => `WelcomeScreen()));`
                     },
                   ),
                 ],
               ),
             ),
               ],
             ),

           ),

         ],
      ),
    );
  }
}

Use backgroundColor: Colors.white property in Drawer widget and you are all set to go.