How to fix layout issue with flutter license colors?

I am designing an ios app, and am new to Flutter. I having trouble figuring out how to get the Flutter license page to display so that it's readable.

When I test on the simulator, the Flutter license page looks fine. It has a black background with white text.

However, when I test the app on my device, it's not readable. The background switches to white and it's all messed up.

I have updated my theme data to affect the look of the Flutter license so that it's readable.

I'm not sure what I'm doing wrong. If anyone has any experience dealing with this or advice for me, that would be greatly appreciated.

main.dart file where I control the color of the app

I edited three specific parts of the theme data in my main.dart file. They were heading 5, bodyText2, and caption. when I did this, I could properly read the Flutter license on my simulator , but still seems to not work when i test on device.

theme: ThemeData(
        primaryColor: Color(0XFFeb1555),
        accentColor: Color(0XFF5173A8),
        scaffoldBackgroundColor: Color(0xff1D1E33),
        canvasColor: Colors.black,
        textTheme: TextTheme(
          headline5: TextStyle(
            color: Colors.white,
          ),
          caption: TextStyle(
            color: Colors.white,
          ),
          bodyText2: TextStyle(
              color: Colors.white, fontSize: 20.0, fontWeight: FontWeight.bold),
        ),
      ),

my settings.dart page where I list the Flutter license

import 'package:flutter/material.dart';
import 'package:tarotcards/screens/disclaimer.dart';
import 'package:url_launcher/url_launcher.dart';

_launchSupportURL() async {
  const String url =
      'mailto:terratarotapp@gmail.com?subject=Terra%20Tarot%20App%20Feedback';
  if (await canLaunch(url)) {
    await launch(url);
  } else {
    throw 'Could not launch $url';
  }
}

_launchSocialURL() async {
  const String url = 'http://instagram.com/terra_tarot';
  if (await canLaunch(url)) {
    await launch(url);
  } else {
    throw 'Could not launch $url';
  }
}

class Settings extends StatefulWidget {
  @override
  _SettingsState createState() => _SettingsState();
}

class _SettingsState extends State<Settings> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black26,
      body: SafeArea(
        child: Column(
          children: <Widget>[
            Container(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: <Widget>[
                  Image.asset(
                    'images/castle.png',
                    height: 65,
                    fit: BoxFit.fill,
                  ),
                ],
              ),
            ),
            Container(
              padding: EdgeInsets.fromLTRB(0, 20.0, 0, 10.0),
              child: Text(
                'GREETINGS',
                style: TextStyle(
                  fontSize: 40.0,
                  fontFamily: 'Pacifico',
                  fontWeight: FontWeight.bold,
                  color: Colors.white,
                ),
              ),
            ),
            Text(
              'TAROT READER',
              style: TextStyle(
                fontSize: 20.0,
                fontFamily: 'San Source Pro',
                color: Color(0XFFeb1555),
              ),
            ),
            Container(
              padding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 0.0),
              child: Text(
                'Do you have feedback on how to improve the app?'
                ' I\'d love to hear from you!',
                style: TextStyle(
                    color: Colors.white,
                    letterSpacing: 0.5,
                    height: 1.5,
                    fontFamily: 'Opensans',
                    fontSize: 16.0,
                    fontWeight: FontWeight.normal),
              ),
            ),
            SizedBox(
              height: 20.0,
            ),
            ButtonTheme(
              minWidth: 300.0,
              child: RaisedButton(
                child: Text('SEND FEEDBACK'),
                padding: EdgeInsets.all(10.0),
                textColor: Colors.white,
                color: Color(0XFFeb1555),
                onPressed: _launchSupportURL,
              ),
            ),
            SizedBox(
              height: 20.0,
            ),
            ButtonTheme(
              minWidth: 300.0,
              child: RaisedButton(
                child: Text('INSTAGRAM'),
                padding: EdgeInsets.all(10.0),
                textColor: Colors.black,
                color: Colors.white,
                onPressed: _launchSocialURL,
              ),
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                FlatButton(
                  child: Text(
                    'Disclaimer →',
                    style: TextStyle(
                      color: Color(0XFFeb1555),
                    ),
                  ),
                  onPressed: () {
                    Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => Disclaimer(),
                        ));
                  },
                ),
                FlatButton(
                  child: Text(
                    'Licenses →',
                    style: TextStyle(
                      color: Color(0XFFeb1555),
                    ),
                  ),
                  onPressed: () {
                    showLicensePage(
                      context: context,
                      applicationName: 'Terra Tarot',
                      applicationVersion: '1.0.0',
                    );
                  },
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}