diff --git a/app/src/main/res/values-sw600dp/dimens.xml b/app/src/main/res/values-sw600dp/dimens.xml
new file mode 100644
index 0000000..44f01db
--- /dev/null
+++ b/app/src/main/res/values-sw600dp/dimens.xml
@@ -0,0 +1,8 @@
+<resources>
+
+    <!--
+         Customize dimensions originally defined in res/values/dimens.xml (such as
+         screen margins) for sw600dp devices (e.g. 7" tablets) here.
+    -->
+
+</resources>
diff --git a/app/src/main/res/values-sw720dp-land/dimens.xml b/app/src/main/res/values-sw720dp-land/dimens.xml
new file mode 100644
index 0000000..61e3fa8
--- /dev/null
+++ b/app/src/main/res/values-sw720dp-land/dimens.xml
@@ -0,0 +1,9 @@
+<resources>
+
+    <!--
+         Customize dimensions originally defined in res/values/dimens.xml (such as
+         screen margins) for sw720dp devices (e.g. 10" tablets) in landscape here.
+    -->
+    <dimen name="activity_horizontal_margin">128dp</dimen>
+
+</resources>
diff --git a/app/src/main/res/values-v11/styles.xml b/app/src/main/res/values-v11/styles.xml
new file mode 100644
index 0000000..7266873
--- /dev/null
+++ b/app/src/main/res/values-v11/styles.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <!--
+        Base application theme for API 11+. This theme completely replaces
+        AppBaseTheme from res/values/styles.xml on API 11+ devices.
+    -->
+    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
+        <!-- API 11 theme customizations can go here. -->
+    </style>
+
+</resources>
diff --git a/app/src/main/res/values-v14/styles.xml b/app/src/main/res/values-v14/styles.xml
new file mode 100644
index 0000000..664f4f1
--- /dev/null
+++ b/app/src/main/res/values-v14/styles.xml
@@ -0,0 +1,12 @@
+<resources>
+
+    <!--
+        Base application theme for API 14+. This theme completely replaces
+        AppBaseTheme from BOTH res/values/styles.xml and
+        res/values-v11/styles.xml on API 14+ devices.
+    -->
+    <style name="AppBaseTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- API 14 theme customizations can go here. -->
+    </style>
+
+</resources>
diff --git a/app/src/main/res/values-w820dp/dimens.xml b/app/src/main/res/values-w820dp/dimens.xml
new file mode 100644
index 0000000..63fc816
--- /dev/null
+++ b/app/src/main/res/values-w820dp/dimens.xml
@@ -0,0 +1,6 @@
+<resources>
+    <!-- Example customization of dimensions originally defined in res/values/dimens.xml
+         (such as screen margins) for screens with more than 820dp of available width. This
+         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
+    <dimen name="activity_horizontal_margin">64dp</dimen>
+</resources>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 0000000..55c1e59
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,7 @@
+<resources>
+
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+
+</resources>