如何使用Stack Widget中的定位Widget？

我想获得这样的屏幕（上图），但是当我尝试制作它时，我只是得到这个屏幕（下图），我不知道如何获得上屏幕。请帮助我。我认为我的代码有问题。

这是我的代码。

import 'package:flutter/material.dart';

class SettingScreen extends StatefulWidget {
  const SettingScreen({super.key});[![enter image description here][2]][2]

  @override
  State<SettingScreen> createState() => _SettingScreenState();
}

class _SettingScreenState extends State<SettingScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
          child: Column(
        children: [
          Container(
            width: double.infinity,
            height: 100,
            decoration: BoxDecoration(
                boxShadow: const [
                  BoxShadow(
                      color: Colors.black26,
                      blurRadius: 90,
                      offset: Offset(4, 9))
                ],
                gradient: LinearGradient(
                    colors: [
                      Color.fromARGB(255, 170, 148, 210),
                      Color.fromARGB(255, 65, 160, 195),
                      Color.fromARGB(255, 134, 174, 207),
                      Color.fromARGB(255, 155, 187, 212),
                    ],
                    begin: Alignment.topLeft,
                    end: Alignment.topRight,
                    stops: [0.2, 0.7, 0.9, 1.4])),
            child: Padding(
              padding: const EdgeInsets.all(18.0),
              child: Row(children: [
                Text(
                  "REL" + '\n' + "  ATE",
                  style: TextStyle(
                    color: Colors.white,
                    fontWeight: FontWeight.bold,
                    fontSize: 10,
                    letterSpacing: 20,
                  ),
                ),
                SizedBox(
                  width: 130,
                ),
                Icon(
                  Icons.skip_next_rounded,
                  color: Colors.white,
                  size: 50,
                ),
              ]),
            ),
          ),
          Stack(
            children: [
              Container(
                width: 300,
                height: 522,
                decoration:
                    BoxDecoration(color: Colors.white, boxShadow: const [
                  BoxShadow(
                    color: Colors.black,
                    offset: Offset(1, 2),
                    blurRadius: 50,
                  )
                ]),
              ),
              Positioned(
                top: 10,
                right: 3,
                child: SizedBox(
                  child: Container(
                    // width: 500,
                    child: Column(
                      children: [
                        Text(
                          "SETTINGS",
                          style: TextStyle(
                              color: Colors.black,
                              fontWeight: FontWeight.bold,
                              fontSize: 30,
                              letterSpacing: 20),
                        ),
                        Padding(
                          padding: EdgeInsets.only(right: 100, top: 10),
                          child: Text(
                            "ACCOUNT",
                            style: TextStyle(color: Colors.grey),
                          ),
                        ),
                        Divider(
                          color: Colors.grey,
                          thickness: 100,
                          height: 20,
                        )
                      ],
                    ),
                  ),
                ),
              )
            ],
          )
        ],
      )),
    );
  }
}

但我看到第二个屏幕，“设置”中缺少“S”。请帮助我。