diff --git a/usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/MainActivity.java b/usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/MainActivity.java
index 4dd5308..34e97c8 100644
--- a/usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/MainActivity.java
+++ b/usbSerialExamples/src/main/java/com/hoho/android/usbserial/examples/MainActivity.java
@@ -2,9 +2,13 @@ package com.hoho.android.usbserial.examples;
 
 import android.content.Intent;
 import android.os.Bundle;
-import androidx.fragment.app.FragmentManager;
+
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.FragmentManager;
 
 public class MainActivity extends AppCompatActivity implements FragmentManager.OnBackStackChangedListener {
 
@@ -12,6 +16,12 @@ public class MainActivity extends AppCompatActivity implements FragmentManager.O
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            Insets ime = insets.getInsets(WindowInsetsCompat.Type.ime());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, Math.max(systemBars.bottom, ime.bottom));
+            return insets;
+        });
         Toolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
         getSupportFragmentManager().addOnBackStackChangedListener(this);
diff --git a/usbSerialExamples/src/main/res/layout/activity_main.xml b/usbSerialExamples/src/main/res/layout/activity_main.xml
index 8cde2fb..73937e1 100644
--- a/usbSerialExamples/src/main/res/layout/activity_main.xml
+++ b/usbSerialExamples/src/main/res/layout/activity_main.xml
@@ -3,13 +3,16 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="?attr/colorPrimaryDark"
     tools:context=".MainActivity">
 
     <com.google.android.material.appbar.AppBarLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
+        android:layout_height="wrap_content"
+        android:background="?attr/colorPrimaryDark">
 
         <androidx.appcompat.widget.Toolbar
             android:id="@+id/toolbar"
@@ -23,6 +26,7 @@
         android:id="@+id/fragment"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:background="?android:attr/windowBackground"
         app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
 
 </androidx.coordinatorlayout.widget.CoordinatorLayout>