Follow system palette in the black Material You theme

        <item name="iconCalendarAccount">@android:color/white</item>

    </style>

    <style name="CalendarAppThemeBlackMonet" parent="Theme.AppCompat.NoActionBar">

        <item name="colorPrimary">@color/colorPrimary</item>

        <item name="colorPrimary">@android:color/system_accent1_500</item>

        <item name="colorPrimaryDark">@color/bg_black</item>

        <item name="colorAccent">@color/colorAccent</item>

        <item name="colorAccent">@android:color/system_accent2_400</item>

        <item name="light_dark">@android:color/white</item>

        <item name="android:windowBackground">@color/bg_black</item>

        <item name="actionBarPopupTheme">@style/ThemeOverlay.AppCompat.Dark</item>