Signal-Android/app/src/main/res/values-night/signal_styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Signal.Widget.CompoundButton.RadioButton" parent="Widget.AppCompat.CompoundButton.RadioButton">
        <item name="colorControlNormal">@color/core_grey_20</item>
    </style>

    <style name="Signal.DayNight.Popup" parent="@style/ThemeOverlay.AppCompat.Dark" />

    <style name="Signal.DayNight.Toolbar.Overflow" parent="@style/Signal.Toolbar.Overflow" />

    <style name="Signal.DayNight.TitleTextStyle" parent="@style/TextSecure.TitleTextStyle.Dark" />
</resources>