ViewGroupsTest layout.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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black">

    <android.support.constraint.Guideline
        android:id="@+id/guideline_h50"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_h90"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.90" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_v90"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.90" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_v10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.1" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_v20"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.2" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_v80"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.8" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_h20"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.2" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline_h80"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.8" />

    <View
        android:id="@+id/foreground_panel"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#828390"
        android:elevation="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline_h90"
        app:layout_constraintEnd_toStartOf="@+id/guideline_v90"
        app:layout_constraintStart_toStartOf="@+id/guideline_v10"
        app:layout_constraintTop_toBottomOf="@+id/guideline_h50" />

    <FrameLayout
        android:id="@+id/content_outer"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#192f46"
        app:layout_constraintBottom_toBottomOf="@+id/guideline_h80"
        app:layout_constraintEnd_toStartOf="@id/guideline_v80"
        app:layout_constraintStart_toEndOf="@+id/guideline_v20"
        app:layout_constraintTop_toTopOf="@+id/guideline_h20">

        <ScrollView
            android:id="@+id/content_inner"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="8dp"
            android:background="?android:attr/colorPrimary">

            <TextView
                android:id="@+id/text"
                android:padding="4dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/material_design" />
        </ScrollView>
    </FrameLayout>

</android.support.constraint.ConstraintLayout>