GitJournal/lib/main_webview.dart

import 'package:flutter/material.dart';

import 'package:gitjournal/widgets/katex_widget.dart';

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

/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: MyWidget(),
    );
  }
}

class MyWidget extends StatelessWidget {
  MyWidget({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Sample Code'),
      ),
      body: Center(
        child: Column(
          children: <Widget>[
            KatexWidget(r"\\pm\\sqrt{a^2 + b^2}"),
            KatexWidget(r"\\pm\\sqrt{c^2 + d^2}"),
          ],
        ),
      ),
    );
  }
}