main.dart

void main() => runApp(
      StatefulBuilder(builder: (context, setState) {
        return MaterialApp(
          home: Scaffold(
            appBar: AppBar(
              backgroundColor: Colors.white,
              title: TextField(
                style: TextStyle(fontSize: 22),
                decoration: InputDecoration(hintText: "Search"),
                onChanged: (t) {
                  setState(() => search = t);
                },
              ),
            ),
            body: Scrollbar(
              child: SingleChildScrollView(
                child: RichText(
                  textScaleFactor: 2,
                  text: searchMatch(
                    text,
                  ),
                ),
              ),
            ),
          ),
        );
      }),
    );