A cor do container não muda junto com o Primary color do Theme

import 'package:flutter/material.dart';

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

class ByteBankApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
          primaryColor: Colors.green[900],
          accentColor: Colors.blueAccent[700],
          buttonTheme: ButtonThemeData(
            buttonColor: Colors.blueAccent[700],
            textTheme: ButtonTextTheme.primary,
          )),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Dashboard'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Image.asset('images/bytebank_logo.png'),
            ),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Container(
                padding: EdgeInsets.all(8.0),
                height: 100,
                width: 150,
                color: Theme.of(context).primaryColor,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: <Widget>[
                    Icon(
                      Icons.people,
                      color: Colors.white,
                      size: 24,
                    ),
                    Text(
                      "Contatos",
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}