activity_main.xml
<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <LinearLayout

        android:layout_width="600dp"
        android:layout_height="fill_parent"
        android:background="#E3D980"
        android:orientation="vertical"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="0dp">

        <TextView
            android:id="@+id/textView1"
            android:layout_marginTop="60dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/szoveg_1"
            android:textSize="24sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/pluszgomb"
            android:layout_marginTop="40dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/plusz"
            tools:layout_editor_absoluteX="162dp"
            tools:layout_editor_absoluteY="182dp" />


        <Button
            android:id="@+id/minuszgomb"
            android:layout_marginTop="40dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/minusz"
            tools:layout_editor_absoluteX="162dp"
            tools:layout_editor_absoluteY="282dp" />

        <Button
            android:id="@+id/kilepgomb"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp"
            android:gravity="center"
            android:text="@string/kilep"
            android:textSize="24sp"
            tools:layout_editor_absoluteX="162dp"
            tools:layout_editor_absoluteY="382dp" />


    </LinearLayout>


    </androidx.constraintlayout.widget.ConstraintLayout>