diff --git a/app/src/main/res/values-v27/styles.xml b/app/src/main/res/values-v27/styles.xml
index 29c52ca1..6287fde3 100755
--- a/app/src/main/res/values-v27/styles.xml
+++ b/app/src/main/res/values-v27/styles.xml
@@ -11,7 +11,7 @@
     </style>
 
     <style name="AppTheme.Black" parent="AppBaseTheme.Black">
-        <item name="android:navigationBarColor">?android:attr/colorBackground</item>
+        <item name="android:navigationBarColor">@color/black</item>
         <item name="android:windowLightNavigationBar">false</item>
     </style>
 </resources>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 1385a597..a1dc9448 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -14,6 +14,8 @@
 
     <color name="warning_red">#b71c1c</color>                   <!-- material_red_900 -->
 
+    <color name="black">#000000</color>
+
     <color name="dark_thumbnail_background">#ffe0e0e0</color>   <!-- material_grey_300 -->
 
     <color name="fab_small_label_background">#212121</color>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index b3cad063..df146fd5 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -91,7 +91,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
 
-        <item name="windowBackground">@android:color/black</item>
+        <item name="windowBackground">@color/black</item>
         <item name="thumbnailBackground">@color/dark_thumbnail_background</item>
 
         <item name="colorGithub">@color/github_light</item>
@@ -100,7 +100,7 @@
         <item name="cardStyle">@style/CardViewStyle.Black</item>
         <item name="dialogTheme">@style/DialogTheme.Dark</item>
 
-        <item name="about_libraries_card">@android:color/black</item>
+        <item name="about_libraries_card">@color/black</item>
         <item name="about_libraries_title_openSource">@color/about_libraries_text_openSource_dark</item>
         <item name="about_libraries_text_openSource">@color/about_libraries_text_openSource_dark</item>
         <item name="about_libraries_dividerDark_openSource">@color/about_libraries_dividerDark_openSource_dark</item>
@@ -110,7 +110,7 @@
     <style name="AppTheme.Black" parent="AppBaseTheme.Black"/>
 
     <style name="CardViewStyle.Black">
-        <item name="cardBackgroundColor">@android:color/black</item>
+        <item name="cardBackgroundColor">@color/black</item>
     </style>
 
     <style name="AppTheme.Black.NoActionBar">