diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..1816f34
--- /dev/null
+++ b/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,6 @@
+<?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>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index b3a2f57..fd07bfd 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-
-    <style name="Theme.Bookkeeping" parent="android:Theme.Material.Light.NoActionBar" />
+    <style name="Theme.Bookkeeping" parent="android:Theme.Material.Light.NoActionBar">
+        <item name="android:windowBackground">@android:color/white</item>
+    </style>
 </resources>
\ No newline at end of file