<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"

    tools:context=".MainActivity"
    tools:ignore="MergeRootFrame"

    android:layout_height="match_parent"
    android:layout_width="match_parent"

    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        app:theme="@style/ThemeOverlay.AppCompat.ActionBar"

        android:id="@+id/appToolbar"

        android:layout_height="wrap_content"
        android:layout_width="match_parent"

        android:background="?attr/colorPrimary"
        android:minHeight="?attr/actionBarSize"/>

    <FrameLayout
        android:id="@+id/container"

        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"

    tools:context=".MainActivity"
    tools:ignore="MergeRootFrame"

    android:layout_height="match_parent"
    android:layout_width="match_parent"

    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        app:theme="@style/ThemeOverlay.AppCompat.ActionBar"

        android:id="@+id/appToolbar"

        android:layout_height="wrap_content"
        android:layout_width="match_parent"

        android:background="?attr/colorPrimary"
        android:elevation="2dp"
        android:minHeight="?attr/actionBarSize"/>

    <FrameLayout
        android:id="@+id/container"

        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

Use an elevation of 2dp for the Toolbar
Use an elevation of 2dp for the Toolbar
