Eduar2TC

import 'package:flutter/material.dart';

import 'dart:math';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override

Eduar2TC

 <Button
            android:id="@+id/menu_button"
            android:layout_width="55dp"
            android:layout_height="55dp"
            android:layout_marginStart="10dp"
            android:layout_weight="0"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:minWidth="0dp"
            android:minHeight="0dp"

Eduar2TC

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="100dp"
        android:layout_height="100dp"