activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/cons"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/gradient"
    android:clickable="true"
    android:focusableInTouchMode="true"
    tools:context=".MainActivity"
    android:focusable="true">

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="369dp"
        android:layout_height="567dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="100dp"
        android:layout_marginEnd="20dp"
        android:layout_marginBottom="100dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0">

        <TextView
            android:id="@+id/textView3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="25dp"
            android:layout_marginTop="30dp"
            android:layout_marginRight="25dp"
            android:hint="@string/email_address"
            android:text="@string/email_message"
            android:textColor="#FFF9F9"
            android:textSize="28sp" />

        <EditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="25dp"
            android:layout_marginTop="40dp"
            android:layout_marginRight="25dp"
            android:backgroundTint="#FFFFFF"
            android:ems="10"
            android:hint="@string/email"
            android:importantForAutofill="no"
            android:inputType="textEmailAddress"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            android:textColor="#FFFFFF"
            android:textColorHint="#FFFFFF" />

        <EditText
            android:id="@+id/subj"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="25dp"
            android:layout_marginTop="40dp"
            android:layout_marginRight="25dp"
            android:autofillHints=""
            android:backgroundTint="#FFFFFF"
            android:ems="10"
            android:hint="@string/subject"
            android:inputType="textPersonName"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            android:textColor="#FFFFFF"
            android:textColorHint="#FFFFFF" />

        <EditText
            android:id="@+id/message"
            android:layout_width="match_parent"
            android:layout_height="227dp"
            android:layout_marginLeft="25dp"
            android:layout_marginTop="40dp"
            android:layout_marginRight="25dp"
            android:autofillHints=""
            android:backgroundTint="#FFFFFF"
            android:ems="10"
            android:gravity="start|top"
            android:hint="@string/enter_your_message_here"
            android:inputType="textMultiLine"
            android:textColor="#FFFFFF"
            android:textColorHint="#FFFFFF" />

    </LinearLayout>

    <Button
        android:id="@+id/btnSend"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/linearLayout2"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="160dp"
        android:layout_marginBottom="-80dp"
        android:backgroundTint="#26D0CE"
        android:text="@string/send"
        android:textColor="#FFFFFF"
        android:textStyle="bold"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout2" />

</RelativeLayout>