Can't figure out how to position and modify the size of the Container – Flutter

I’m making a pomodoro app in flutter right now and I’m almost finished except I can’t position and modify the size of the Container that shows the pomodoros text and the number of pomodoros.

`

import 'dart:async';

import 'package:flutter/material.dart';

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  static const twentyFiveMinutes = 1500;
  int totalSeconds = twentyFiveMinutes;
  bool isRunning = false;
  int totalPomodoros = 0;
  late Timer timer;
  // late is a modifier that means that you don't have to initialize the property immediately but you have a promise (a contract) that you will initialize the property before you use it
  // it basically means you'll initializer later

  void onTick(Timer timer) {
    if (totalSeconds == 0) {
      setState(() {
        totalPomodoros = totalPomodoros + 1;
        isRunning = false;
        totalSeconds = twentyFiveMinutes;
      });
      timer.cancel();
    } else {
      setState(() {
        totalSeconds = totalSeconds - 1;
      });
    }
  }

  void onStartPressed() {
    timer = Timer.periodic(
      const Duration(seconds: 1),
      onTick,
    );
    setState(() {
      isRunning = true;
    }); //onTick() will gonna call the function immidiately
  }

  void onPausePressed() {
    timer.cancel();
    setState(() {
      isRunning = false;
    });
  }

  void onResetPressed() {
    timer.cancel();
    setState(() {
      isRunning = false;
      totalSeconds = twentyFiveMinutes; //totalSeconds;
    });
  }

  String format(int seconds) {
    var duration = Duration(seconds: seconds);
    print(duration.toString());
    print(duration.toString().split("."));
    print(duration.toString().split(".").first);
    print(duration.toString().split(".").first.substring(2, 7));
    return duration.toString().split(".").first.substring(
          2,
          7,
        ); //Splits the string at matches of [pattern] and returns a list of substrings.
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).backgroundColor,
      body: Column(
        children: [
          Flexible(
            flex: 1,
            child: Container(
              child: Text(
                format(totalSeconds),
                style: TextStyle(
                  color: Theme.of(context).cardColor,
                  fontSize: 89,
                  fontWeight: FontWeight.w600,
                ),
              ),
            ),
          ),

          Flexible(
            flex: 3,
            child: Center(
              child: IconButton(
                iconSize: 120,
                color: Theme.of(context).cardColor,
                onPressed: isRunning ? onPausePressed : onStartPressed,
                icon: Icon(
                  isRunning
                      ? Icons.pause_circle_outline_outlined
                      : Icons.play_circle_outlined,
                ),
              ),
            ),
          ),

          //child ==> Creates a widget that controls how a child of a [Row], [Column], or [Flex] flexes. Thus, must use child, not children
          //Column ==> Creates a vertical array of children. Thus, must use children, not child
          Flexible(
            flex: 3,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                IconButton(
                  iconSize: 100,
                  color: Theme.of(context).cardColor,
                  onPressed: isRunning ? onResetPressed : onResetPressed,
                  icon: const Icon(
                    Icons.restore_outlined,
                  ),
                ),
              ],
            ),
          ),

          Flexible(
            flex: 1,
            child: Row(
              children: [
                Expanded(
                  child: Container(
                    //alignment: AlignmentDirectional.bottomEnd,
                    decoration: BoxDecoration(
                        color: Theme.of(context).cardColor,
                        borderRadius: BorderRadius.circular(50)),
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Text(
                          'Pomodoros',
                          style: TextStyle(
                            fontSize: 20,
                            color: Theme.of(context).textTheme.headline1!.color,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                        Text(
                          '$totalPomodoros',
                          style: TextStyle(
                            fontSize: 58,
                            color: Theme.of(context).textTheme.headline1!.color,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),
        ], // Flexible alows you to create UIs that don't really have hard coded values like 200 pixels tall or 100 pixels wide
        // alows you to create UIs that are more flexible, more elastic, more based on proportions
        // can specify the ratio so that there is the least difference between the IOS and the Android platform
      ),
    );
  }
}

Current App UI

I tried to add alignment: AlignmentDirectional.bottomEnd syntex but turned out it works way differnt than I expected.

Error version App UI

child: Container(
alignment: AlignmentDirectional.bottomEnd,
decoration: BoxDecoration(
color: Theme.of(context).cardColor,
borderRadius: BorderRadius.circular(50)),

I’m expecting to position the container at the bottom of the UI and resize it a little bigger