android/app/src/main/res/values-v21/styles.xml

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

<resources>

    <style name="AppTheme" parent="android:Theme.Material">
        <item name="android:colorPrimary">@color/primary</item>
        <item name="android:colorPrimaryDark">@color/primaryDark</item>
        <item name="android:textColorPrimary">@color/textPrimary</item>
        <item name="android:textColor">#000000</item>
        <item name="android:windowBackground">@color/windowBackground</item>
        <item name="android:colorButtonNormal">#E0F2F1</item>
    </style>

</resources>