diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 05ae811..649bd83 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -3,7 +3,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="#fff"
+    android:background="@color/white"
     android:orientation="vertical">
 
     <include layout="@layout/toolbar" />
diff --git a/app/src/main/res/layout/activity_preview.xml b/app/src/main/res/layout/activity_preview.xml
index 3fa42c6..b325f60 100644
--- a/app/src/main/res/layout/activity_preview.xml
+++ b/app/src/main/res/layout/activity_preview.xml
@@ -18,7 +18,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
-        android:background="#fff"
+        android:background="@color/white"
         android:gravity="center_vertical|end"
         android:paddingEnd="16dp"
         android:paddingStart="16dp"
diff --git a/app/src/main/res/layout/item_note.xml b/app/src/main/res/layout/item_note.xml
index 0a4bc43..f9015cc 100644
--- a/app/src/main/res/layout/item_note.xml
+++ b/app/src/main/res/layout/item_note.xml
@@ -87,7 +87,7 @@
                 android:paddingStart="4dp"
                 android:paddingTop="2dp"
                 android:text="@string/changed"
-                android:textColor="#fff"
+                android:textColor="@color/white"
                 android:textSize="12sp" />
 
             <TextView
diff --git a/app/src/main/res/layout/item_note_detail_placeholder.xml b/app/src/main/res/layout/item_note_detail_placeholder.xml
index 320caaf..19fe96c 100644
--- a/app/src/main/res/layout/item_note_detail_placeholder.xml
+++ b/app/src/main/res/layout/item_note_detail_placeholder.xml
@@ -81,7 +81,7 @@
                 android:paddingStart="4dp"
                 android:paddingTop="2dp"
                 android:text="@string/changed"
-                android:textColor="#fff"
+                android:textColor="@color/white"
                 android:textSize="12sp" />
 
             <TextView
diff --git a/app/src/main/res/layout/item_note_simple.xml b/app/src/main/res/layout/item_note_simple.xml
index 4d080a3..635ba90 100644
--- a/app/src/main/res/layout/item_note_simple.xml
+++ b/app/src/main/res/layout/item_note_simple.xml
@@ -49,7 +49,7 @@
             android:paddingStart="4dp"
             android:paddingTop="2dp"
             android:text="@string/changed"
-            android:textColor="#fff"
+            android:textColor="@color/white"
             android:textSize="12sp" />
 
         <TextView