Remove glow / edges on Navigation View

my_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        android:orientation="vertical"
        android:theme="@style/Widget.MyTheme.ScrollView">

        <!-- ... -->

    </android.support.design.widget.NavigationView>

</android.support.v4.widget.DrawerLayout>

styles.xml

<resources>
    <!-- @TODO Check how themes work -->
    <style name="Theme.MyTheme" parent="ThemeOverlay.AppCompat.Light">
        <item name="android:listViewStyle">@style/Widget.MyTheme.ListView</item>
        <item name="android:scrollViewStyle">@style/Widget.MyTheme.ScrollView</item>
    </style>
    <style name="Widget.MyTheme.ListView" parent="android:Widget.ListView">
        <item name="android:overScrollMode">never</item>
    </style>
    <style name="Widget.MyTheme.ScrollView" parent="android:Widget.ScrollView">
        <item name="android:overScrollMode">never</item>
    </style>
</resources>