KTC/app/src/main/res/values/styles.xml

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

    <style name="Widget.Theme.KTC.ButtonBar.Fullscreen" parent="">
        <item name="android:background">@color/background</item>
        <item name="android:buttonBarStyle">?android:attr/buttonBarStyle</item>
    </style>

    <style name="Theme.KTC.FullScreenDialog" parent="Theme.KTC">
        <item name="colorPrimaryDark">?attr/colorPrimaryDark</item>
        <item name="colorAccent">?attr/colorAccent</item>
        <item name="colorPrimary">?attr/colorPrimary</item>
        <item name="android:windowIsFloating">false</item>
        <item name="android:windowBackground">@color/background</item>
        <item name="actionMenuTextColor">?attr/colorAccent</item>
    </style>

    <style name="Widget.KTC.AppWidget.Container" parent="android:Widget">
        <item name="android:id">@android:id/background</item>
        <item name="android:background">@color/background</item>
    </style>

    <style name="Widget.KTC.AppWidget.InnerView" parent="android:Widget">
        <item name="android:background">@color/background</item>
        <item name="android:textColor">@color/primary</item>
    </style>
</resources>