activity_home.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"
    android:background="@drawable/bg_main"
    tools:context=".HomeActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginTop="44dp"
        android:gravity="center_horizontal"
        android:text="Hey David"
        android:textColor="#ffffff"
        android:textSize="30sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginTop="84dp"
        android:gravity="center_horizontal"
        android:text="How’s the earth looking today?"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/add_your_stats"
        android:layout_width="350dp"
        android:layout_height="55dp"
        android:layout_marginStart="32dp"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="20dp"
        android:background="@drawable/button_main"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/fun_facts"
        android:layout_width="350dp"
        android:layout_height="160dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="128dp"
        android:layout_marginEnd="16dp"
        android:background="@drawable/button_1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.517"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/personal_stats"
        android:layout_width="350dp"
        android:layout_height="160dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="18dp"
        android:layout_marginEnd="16dp"
        android:background="@drawable/button_2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.517"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/fun_facts" />

    <Button
        android:id="@+id/can_you_help"
        android:layout_width="350dp"
        android:layout_height="160dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="18dp"
        android:layout_marginEnd="16dp"
        android:background="@drawable/button_3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.555"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/personal_stats" />

</androidx.constraintlayout.widget.ConstraintLayout>