app/src/main/res/values-night/themes.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <style name="Theme.Bookkeeping" parent="android:Theme.Material.NoActionBar">
-        <item name="android:windowBackground">@android:color/black</item>
-    </style>
-</resources>

app/src/main/res/values/themes.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <style name="Theme.Bookkeeping" parent="android:Theme.Material.Light.NoActionBar">
+
-        <item name="android:windowBackground">@android:color/white</item>
+    <style name="Theme.Bookkeeping" parent="android:Theme.Material.Light.NoActionBar" />
-    </style>
 </resources>