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"
    android:background="@drawable/app_back"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/math_icon"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="@drawable/math"
        android:onClick="mainOnClick"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.199"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.379" />

    <TextView
        android:id="@+id/result1"
        android:layout_width="189dp"
        android:layout_height="75dp"
        android:textColor="@color/white"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.526"
        app:layout_constraintStart_toEndOf="@+id/math_icon"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.376" />

    <TextView
        android:id="@+id/welcome"
        android:layout_width="274dp"
        android:layout_height="85dp"
        android:text="Welcome! Do you wanna train your brain?"
        android:textColor="@color/white"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.085" />

    //#69B69A

    <Button
        android:id="@+id/maze_icon"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="@drawable/maze"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.198"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/math_icon"
        app:layout_constraintVertical_bias="0.222" />

    <TextView
        android:id="@+id/result2"
        android:layout_width="189dp"
        android:layout_height="75dp"
        android:textColor="@color/white"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.526"
        app:layout_constraintStart_toEndOf="@+id/maze_icon"
        app:layout_constraintTop_toBottomOf="@+id/result1"
        app:layout_constraintVertical_bias="0.232" />

    <TextView
        android:id="@+id/math_txt"
        android:layout_width="140dp"
        android:layout_height="19dp"
        android:layout_marginBottom="40dp"
        android:text="You Do The Math!"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@+id/maze_icon"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.169"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/math_icon"
        app:layout_constraintVertical_bias="0.923" />

    <TextView
        android:id="@+id/maze_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Rotating Maze"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.175"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/maze_icon"
        app:layout_constraintVertical_bias="0.047" />
</androidx.constraintlayout.widget.ConstraintLayout>