vertical_text.dart

class _MyHomePageState extends State<MyHomePage> {
  String myText = "0123456789";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Wrap(
          alignment: WrapAlignment.center,
          direction: Axis.vertical,  //stack individual text widgets on top of each other
          children: _arrayOfText(),
        ),
      ),
    );
  }

  List<Text> _arrayOfText() { // split our text into individual text widgets
    return myText
        .split("")
        .map((letter) => Text(
              letter,
              textAlign: TextAlign.center,
              style: TextStyle(
                  fontWeight: FontWeight.w100,
                  fontSize: 40,
                  color: Colors.white),
            ))
        .toList();
  }
}