diff --git a/app/src/main/res/layout-land/fragment_stopwatch.xml b/app/src/main/res/layout-land/fragment_stopwatch.xml
index e3d28c4..a942981 100644
--- a/app/src/main/res/layout-land/fragment_stopwatch.xml
+++ b/app/src/main/res/layout-land/fragment_stopwatch.xml
@@ -20,7 +20,7 @@
                 android:layout_width="0dp"
                 android:layout_height="match_parent"
                 android:layout_weight="1"
-                android:background="@color/colorPrimary"
+                android:background="?attr/colorPrimary"
                 android:gravity="center"
                 android:textSize="@dimen/text_size_display_3"
                 style="@style/TextAppearance.AppCompat.Inverse"/>
@@ -56,7 +56,7 @@
                 app:layout_columnWeight="1"
                 app:layout_gravity="center"
                 app:fabSize="mini"
-                app:backgroundTint="@color/colorPrimary"/>
+                app:backgroundTint="?attr/colorPrimary"/>
 
             <android.support.design.widget.FloatingActionButton
                 android:id="@+id/stop"
@@ -68,7 +68,7 @@
                 app:layout_columnWeight="1"
                 app:layout_gravity="center"
                 app:fabSize="mini"
-                app:backgroundTint="@color/colorPrimary"/>
+                app:backgroundTint="?attr/colorPrimary"/>
 
         </android.support.v7.widget.GridLayout>
 
diff --git a/app/src/main/res/layout/fragment_stopwatch.xml b/app/src/main/res/layout/fragment_stopwatch.xml
index de79257..16001cd 100644
--- a/app/src/main/res/layout/fragment_stopwatch.xml
+++ b/app/src/main/res/layout/fragment_stopwatch.xml
@@ -15,7 +15,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:padding="@dimen/chronometer_padding"
-            android:background="@color/colorPrimary"
+            android:background="?attr/colorPrimary"
             android:gravity="center_horizontal"
             android:textSize="@dimen/text_size_display_3"
             style="@style/TextAppearance.AppCompat.Inverse"/>
@@ -52,7 +52,7 @@
             app:layout_columnWeight="1"
             app:layout_gravity="center"
             app:fabSize="mini"
-            app:backgroundTint="@color/colorPrimary"/>
+            app:backgroundTint="?attr/colorPrimary"/>
 
         <android.support.design.widget.FloatingActionButton
             android:id="@+id/stop"
@@ -64,7 +64,7 @@
             app:layout_columnWeight="1"
             app:layout_gravity="center"
             app:fabSize="mini"
-            app:backgroundTint="@color/colorPrimary"/>
+            app:backgroundTint="?attr/colorPrimary"/>
 
     </android.support.v7.widget.GridLayout>