content: import 'package:flutter/material.dart';
  
  class PriceScreen extends StatefulWidget {
    @override
    _PriceScreenState createState() => _PriceScreenState();
  }
  
  class _PriceScreenState extends State<PriceScreen> {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          title: Text('🤑 Coin Ticker'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.fromLTRB(18.0, 18.0, 18.0, 0),
              child: Card(
                color: Colors.lightBlueAccent,
                elevation: 5.0,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(10.0),
                ),
                child: Padding(
                  padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 28.0),
                  child: Text(
                    '1 BTC = ? USD',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                      fontSize: 20.0,
                      color: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
            Container(
              height: 150.0,
              alignment: Alignment.center,
              padding: EdgeInsets.only(bottom: 30.0),
              color: Colors.lightBlue,
              child: null,
            ),
          ],
        ),
      );
    }
  }
  