Flutter 如何更改ElevatedButton的 colored颜色 以按下它

我想将按钮 colored颜色 从浅蓝色更改为绿色，以及文本. 我可以改变文字，但我不能改变 colored颜色 .我还没解决. 我想在'onPressed()'中使用'setState()'来在我按下按钮时改变 colored颜色 . 如果我使用styleFrom，我可以在setState中使用styleFrom来更改 colored颜色 吗？ 我该怎么办？ 有它的源代码.

import 'package:flutter/material.dart';

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

/// This is the main application widget.
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: const MyStatefulWidget(),
      ),
    );
  }
}

/// This is the stateful widget that the main application instantiates.
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// This is the private State class that goes with MyStatefulWidget.
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  String frontText = "Press the Button to see studuent infomation";
  @override
  Widget build(BuildContext context) { // Defining Main Widget plqcing on Scaffold
    final ButtonStyle style = ElevatedButton.styleFrom();

    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Text(
            "$frontText", key: Key("textKey"),
            style: TextStyle(color: Colors.blue, fontSize: 15),
          ),
          const SizedBox(height: 20),
          ElevatedButton(
            style: ElevatedButton.styleFrom( // Setting the ElevatedButton style
                backgroundColor: Colors.lightBlue[50],
                foregroundColor: Colors.blue,
                textStyle: TextStyle(fontSize: 20)
            ),
            child: const Text('Push'),
            onPressed: () {
              setState(() { // once push the button, text printed over the button will be changed
                frontText = "20190952, 윤영준";
                ElevatedButton.styleFrom(
                  backgroundColor: Colors.green
                ); // I want change color to green, but i can't
              });
            },
          ),
        ],
      ),
    );
  }
}

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