main.dart

import 'package:flutter/material.dart';

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

extension ColorExtension on String {
  toColor() {
    var hexColor = this.replaceAll("#", "");
    if (hexColor.length == 6) {
      hexColor = "FF" + hexColor;
    }
    if (hexColor.length == 8) {
      return Color(int.parse("0x$hexColor"));
    }
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Welcome to Flutter',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Welcome to Flutter'),
        ),
        body: Center(
          child: Text(
            'Hello World',
            style: TextStyle(backgroundColor: '#bfeb91'.toColor()), // or 'bfeb91', or 'ffbfeb91'
          ),
        ),
      ),
    );
  }
}