so_service_widget.dart

import 'package:flutter/material.dart';
import './myservice.dart';

class Service extends StatelessWidget {
  final MyService myService;
  Service(this.myService);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.yellow,
      width: double.infinity,
      child: Text(
        '${myService.myVariable}',
        textAlign: TextAlign.center,
        style: TextStyle(
          fontSize: 25,
          fontWeight: FontWeight.bold,
        ),
      ),
    );
  }
}