diff --git a/app/src/main/res/drawable-v21/material_blue_button_lighter.xml b/app/src/main/res/drawable-v21/material_blue_button_lighter.xml
new file mode 100644
index 00000000..83ec9cd7
--- /dev/null
+++ b/app/src/main/res/drawable-v21/material_blue_button_lighter.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright 2013 serso aka se.solovyev
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~    http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Contact details
+  ~
+  ~ Email: se.solovyev@gmail.com
+  ~ Site:  http://se.solovyev.org
+  -->
+
+<ripple xmlns:a="http://schemas.android.com/apk/res/android"
+    a:color="@color/ripple_material_dark">
+    <item>
+        <shape>
+            <solid a:color="@color/cpp_material_blue_lighter" />
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable-v21/material_button_dark_lighter.xml b/app/src/main/res/drawable-v21/material_button_dark_lighter.xml
new file mode 100644
index 00000000..91db8a6d
--- /dev/null
+++ b/app/src/main/res/drawable-v21/material_button_dark_lighter.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright 2013 serso aka se.solovyev
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~    http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Contact details
+  ~
+  ~ Email: se.solovyev@gmail.com
+  ~ Site:  http://se.solovyev.org
+  -->
+
+<ripple xmlns:a="http://schemas.android.com/apk/res/android"
+    a:color="@color/ripple_material_dark">
+    <item>
+        <shape>
+            <solid a:color="@color/cpp_metro_button_lighter" />
+        </shape>
+    </item>
+</ripple>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/material_blue_button_lighter.xml b/app/src/main/res/drawable/material_blue_button_lighter.xml
new file mode 100644
index 00000000..4f544546
--- /dev/null
+++ b/app/src/main/res/drawable/material_blue_button_lighter.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright 2013 serso aka se.solovyev
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~    http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Contact details
+  ~
+  ~ Email: se.solovyev@gmail.com
+  ~ Site:  http://se.solovyev.org
+  -->
+
+<selector xmlns:a="http://schemas.android.com/apk/res/android">
+
+    <item a:state_pressed="true">
+        <shape>
+            <solid a:color="@color/cpp_material_blue_lighter_lighter" />
+        </shape>
+    </item>
+
+    <item>
+        <shape>
+            <solid a:color="@color/cpp_material_blue_lighter" />
+        </shape>
+    </item>
+
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/material_button_dark_lighter.xml b/app/src/main/res/drawable/material_button_dark_lighter.xml
new file mode 100644
index 00000000..319cb1ed
--- /dev/null
+++ b/app/src/main/res/drawable/material_button_dark_lighter.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright 2013 serso aka se.solovyev
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~    http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Contact details
+  ~
+  ~ Email: se.solovyev@gmail.com
+  ~ Site:  http://se.solovyev.org
+  -->
+
+<selector xmlns:a="http://schemas.android.com/apk/res/android">
+
+    <item a:drawable="@drawable/material_button_pressed" a:state_pressed="true" />
+
+    <item>
+        <shape>
+            <solid a:color="@color/cpp_metro_button_lighter" />
+        </shape>
+    </item>
+
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_clear.xml b/app/src/main/res/layout/cpp_app_button_clear.xml
index 6f81a659..b741f791 100644
--- a/app/src/main/res/layout/cpp_app_button_clear.xml
+++ b/app/src/main/res/layout/cpp_app_button_clear.xml
@@ -24,10 +24,9 @@
 
 <org.solovyev.android.views.dragbutton.DirectionDragButton
     a:id="@id/cpp_button_clear"
-    style="?attr/cpp_button_style_control"
+    style="?attr/cpp_button_style_control_highlighted"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:a="http://schemas.android.com/apk/res/android"
-    a:background="@color/grey_850"
     a:text="@string/c_clear"
     app:directionTextUp="MC"
     a:textStyle="bold"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_erase.xml b/app/src/main/res/layout/cpp_app_button_erase.xml
index a6623598..1a05ca1b 100644
--- a/app/src/main/res/layout/cpp_app_button_erase.xml
+++ b/app/src/main/res/layout/cpp_app_button_erase.xml
@@ -25,6 +25,5 @@
 <ImageButton
     xmlns:a="http://schemas.android.com/apk/res/android"
     a:id="@id/cpp_button_erase"
-    a:background="@color/cpp_material_light_darker"
-    style="?attr/cpp_button_style_control"
+    style="?attr/cpp_button_style_operation_highlighted"
     a:src="@drawable/ic_backspace_white_48dp" />
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_percent.xml b/app/src/main/res/layout/cpp_app_button_percent.xml
index 842c63ad..f332536b 100644
--- a/app/src/main/res/layout/cpp_app_button_percent.xml
+++ b/app/src/main/res/layout/cpp_app_button_percent.xml
@@ -24,7 +24,7 @@
 
 <org.solovyev.android.views.dragbutton.DirectionDragButton
     a:id="@id/cpp_button_percent"
-    style="?attr/cpp_button_style_digit"
+    style="?attr/cpp_button_style_control"
     xmlns:a="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/values/attributes.xml b/app/src/main/res/values/attributes.xml
index 99bffa91..2e2d8fa5 100644
--- a/app/src/main/res/values/attributes.xml
+++ b/app/src/main/res/values/attributes.xml
@@ -24,7 +24,9 @@
 
     <attr name="cpp_button_style_digit" format="reference" />
     <attr name="cpp_button_style_control" format="reference" />
+    <attr name="cpp_button_style_control_highlighted" format="reference" />
     <attr name="cpp_button_style_operation" format="reference" />
+    <attr name="cpp_button_style_operation_highlighted" format="reference" />
     <attr name="cpp_main_bg" format="reference" />
     <attr name="cpp_pane_bg" format="reference" />
     <attr name="cpp_fab_bg" format="reference" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index cecafb02..a14325b9 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -37,10 +37,12 @@
     <color name="cpp_wizard_button_pressed">#757575</color>
     <color name="cpp_metro_button_dark">#ff000000</color>
     <color name="cpp_metro_button">@color/grey_900</color>
+    <color name="cpp_metro_button_lighter">@color/grey_850</color>
     <color name="cpp_metro_button_light">@color/grey_800</color>
     <color name="cpp_metro_blue">#10648c</color>
-    <color name="cpp_material_blue">#ff0d4663</color>
-    <color name="cpp_material_blue_lighter">#ff0d668d</color>
+    <color name="cpp_material_blue">#0a4766</color>
+    <color name="cpp_material_blue_lighter">#0d5980</color>
+    <color name="cpp_material_blue_lighter_lighter">#0f6b99</color>
     <color name="cpp_material_light">#ff37b295</color>
     <color name="cpp_material_light_darker">#ff309e84</color>
     <color name="cpp_material_light_disabled">#c1d2ef</color>
diff --git a/app/src/main/res/values/theme_material.xml b/app/src/main/res/values/theme_material.xml
index a2ec39c8..1dc79a43 100644
--- a/app/src/main/res/values/theme_material.xml
+++ b/app/src/main/res/values/theme_material.xml
@@ -28,10 +28,18 @@
 
     <style name="CppKeyboardButton.Material.Control" parent="CppKeyboardButton.Material.Digit" />
 
+    <style name="CppKeyboardButton.Material.Control.Highlighted" parent="CppKeyboardButton.Material.Digit" >
+        <item name="android:background">@drawable/material_button_dark_lighter</item>
+    </style>
+
     <style name="CppKeyboardButton.Material.Operation" parent="CppKeyboardButton.Material.Digit">
         <item name="android:background">@drawable/material_blue_button</item>
     </style>
 
+    <style name="CppKeyboardButton.Material.Operation.Highlighted" parent="CppKeyboardButton.Material.Digit">
+        <item name="android:background">@drawable/material_blue_button_lighter</item>
+    </style>
+
     <style name="CppHeaderButton.Material" parent="CppKeyboardButton.Material.Control">
         <item name="android:layout_width">30dp</item>
         <item name="android:layout_height">30dp</item>
@@ -59,19 +67,25 @@
     <style name="Cpp.Theme.Material" parent="Cpp.Theme">
         <item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
         <item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
+        <item name="cpp_button_style_control_highlighted">@style/CppKeyboardButton.Material.Control.Highlighted</item>
         <item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
+        <item name="cpp_button_style_operation_highlighted">@style/CppKeyboardButton.Material.Operation.Highlighted</item>
     </style>
 
     <style name="Cpp.Theme.Material.Dialog" parent="Cpp.Theme.Dialog">
         <item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
         <item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
+        <item name="cpp_button_style_control_highlighted">@style/CppKeyboardButton.Material.Control.Highlighted</item>
         <item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
+        <item name="cpp_button_style_operation_highlighted">@style/CppKeyboardButton.Material.Operation.Highlighted</item>
     </style>
 
     <style name="Cpp.Theme.Material.Dialog.Alert" parent="Cpp.Theme.Dialog.Alert">
         <item name="cpp_button_style_digit">@style/CppKeyboardButton.Material.Digit</item>
         <item name="cpp_button_style_control">@style/CppKeyboardButton.Material.Digit</item>
+        <item name="cpp_button_style_control_highlighted">@style/CppKeyboardButton.Material.Control.Highlighted</item>
         <item name="cpp_button_style_operation">@style/CppKeyboardButton.Material.Operation</item>
+        <item name="cpp_button_style_operation_highlighted">@style/CppKeyboardButton.Material.Operation.Highlighted</item>
     </style>
 
 </resources>
\ No newline at end of file