SchildiChat-android/vector/src/main/res/values-v27/theme_light.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="AppTheme.Light.v27" parent="AppTheme.Light.v23">
        <item name="android:navigationBarColor">@color/riotx_header_panel_background_light</item>
        <item name="android:windowLightNavigationBar">true</item>
    </style>

    <style name="AppTheme.Light" parent="AppTheme.Light.v27" />

</resources>