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"
    android:background="@drawable/bg2"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="390dp"
        android:layout_height="325dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:textAlignment="center"
        android:hint="Enter the text"
        android:textSize="20dp"
        android:textColor="@color/colorPrimaryDark"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.476"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.192" />

    <Button
        android:id="@+id/button"
        android:layout_width="115dp"
        android:layout_height="47dp"
        android:text="Send >>"
        android:textSize="20dp"
        android:textStyle="bold"
        android:background="@color/colorPrimaryDark"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.81"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.919" />
</androidx.constraintlayout.widget.ConstraintLayout>