diff --git a/res/drawable-v28/round_rect_primary.xml b/res/drawable-v28/round_rect_primary.xml
new file mode 100644
index 0000000..53679ed
--- /dev/null
+++ b/res/drawable-v28/round_rect_primary.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2019 The Android Open Source Project
+
+     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.
+-->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+       android:shape="rectangle">
+    <solid android:color="?android:attr/colorPrimary" />
+    <corners android:radius="?android:attr/dialogCornerRadius" />
+</shape>
diff --git a/res/drawable-v28/top_round_rect_primary.xml b/res/drawable-v28/top_round_rect_primary.xml
new file mode 100644
index 0000000..5c40df7
--- /dev/null
+++ b/res/drawable-v28/top_round_rect_primary.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2018 The Android Open Source Project
+
+     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.
+-->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+       android:shape="rectangle">
+    <solid android:color="?android:attr/colorPrimary" />
+    <corners
+        android:topLeftRadius="?android:attr/dialogCornerRadius"
+        android:topRightRadius="?android:attr/dialogCornerRadius"
+        android:bottomLeftRadius="0dp"
+        android:bottomRightRadius="0dp"
+        />
+</shape>
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 7804133..469b176 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -235,4 +235,8 @@
 <!-- Hints -->
     <dimen name="chip_hint_height">26dp</dimen>
     <dimen name="chip_hint_bottom_margin">194dp</dimen>
+
+<!-- Theming related -->
+    <dimen name="default_dialog_corner_radius">8dp</dimen>
+
 </resources>