crystal-wallet-android/app/src/main/res/layout/activity_intro.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:id="@+id/activity_intro"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary"
    tools:context="cy.agorise.crystalwallet.activities.IntroActivity">

    <SurfaceView
        android:id="@+id/surface_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="2:1.2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/colorPrimaryTransparent"
        app:layout_constraintTop_toTopOf="@id/surface_view"
        app:layout_constraintStart_toStartOf="@id/surface_view"
        app:layout_constraintEnd_toEndOf="@id/surface_view"
        app:layout_constraintBottom_toBottomOf="@id/surface_view"/>

    <ImageView
        android:id="@+id/ivLogo"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:contentDescription="@string/crystal_logo"
        android:src="@drawable/crystal_logo"
        tools:layout_editor_absoluteY="114dp"
        app:layout_constraintTop_toTopOf="@id/surface_view"
        app:layout_constraintBottom_toBottomOf="@id/surface_view"/>

    <TextView
        android:id="@+id/tvNewUser"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:text="@string/new_user"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@+id/btnCreateAccount"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintVertical_bias="0.4"
        app:layout_constraintTop_toBottomOf="@id/surface_view"
        app:layout_constraintVertical_chainStyle="packed" />

    <Button
        android:id="@+id/btnCreateAccount"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginStart="32dp"
        android:layout_marginTop="8dp"
        android:background="@color/colorPrimaryDark"
        android:text="@string/create_account"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/tvExistingUser"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tvNewUser" />

    <TextView
        android:id="@+id/tvExistingUser"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:text="@string/existing_user"
        android:textColor="@color/white"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@+id/btnImportAccount"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnCreateAccount" />

    <Button
        android:id="@+id/btnImportAccount"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginStart="32dp"
        android:layout_marginTop="8dp"
        android:background="@color/colorPrimaryDark"
        android:text="@string/import_account"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tvExistingUser" />

</android.support.constraint.ConstraintLayout>