diff --git a/libs/WindowManager/Shell/tests/flicker/test-apps/flickerapp/res/values/styles.xml b/libs/WindowManager/Shell/tests/flicker/test-apps/flickerapp/res/values/styles.xml
index 87a61a88c0945..23b51cc06f04b 100644
--- a/libs/WindowManager/Shell/tests/flicker/test-apps/flickerapp/res/values/styles.xml
+++ b/libs/WindowManager/Shell/tests/flicker/test-apps/flickerapp/res/values/styles.xml
@@ -16,15 +16,19 @@
   -->
 
 <resources>
-    <style name="CutoutDefault">
+    <style name="DefaultTheme" parent="@android:style/Theme.DeviceDefault">
+        <item name="android:windowBackground">@android:color/darker_gray</item>
+    </style>
+
+    <style name="CutoutDefault" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">default</item>
     </style>
 
-    <style name="CutoutShortEdges">
+    <style name="CutoutShortEdges" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
 
-    <style name="CutoutNever">
+    <style name="CutoutNever" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">never</item>
     </style>
 </resources>
\ No newline at end of file
diff --git a/tests/FlickerTests/test-apps/flickerapp/res/values/styles.xml b/tests/FlickerTests/test-apps/flickerapp/res/values/styles.xml
index 746b0f4ca7e11..589df38eec832 100644
--- a/tests/FlickerTests/test-apps/flickerapp/res/values/styles.xml
+++ b/tests/FlickerTests/test-apps/flickerapp/res/values/styles.xml
@@ -16,15 +16,19 @@
   -->
 
 <resources>
-    <style name="CutoutDefault">
+    <style name="DefaultTheme" parent="@android:style/Theme.DeviceDefault">
+        <item name="android:windowBackground">@android:color/darker_gray</item>
+    </style>
+
+    <style name="CutoutDefault" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">default</item>
     </style>
 
-    <style name="CutoutShortEdges">
+    <style name="CutoutShortEdges" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
     </style>
 
-    <style name="CutoutNever">
+    <style name="CutoutNever" parent="@style/DefaultTheme">
         <item name="android:windowLayoutInDisplayCutoutMode">never</item>
     </style>