diff --git a/Magazyn_Client/Magazyn/App.xaml.cs b/Magazyn_Client/Magazyn/App.xaml.cs
index 4461381..78c801a 100644
--- a/Magazyn_Client/Magazyn/App.xaml.cs
+++ b/Magazyn_Client/Magazyn/App.xaml.cs
@@ -13,5 +13,45 @@ namespace Magazyn
 	/// </summary>
 	public partial class App : Application
 	{
+		protected override void OnStartup(StartupEventArgs e)
+		{
+			ChangeTheme(2);
+			base.OnStartup(e);
+		}
+
+		public void ChangeTheme(int index)
+		{
+			Resources.MergedDictionaries.Clear();
+			Uri[] uris = new Uri[4];
+
+			uris[1] = new Uri("pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml");
+
+			switch (index % 3) {
+				case 0:
+					uris[0] = new Uri("pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml");
+					uris[2] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Blue.xaml");
+					uris[3] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Cyan.xaml");
+					break;
+
+				case 1:
+					uris[0] = new Uri("pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml");
+					uris[2] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Lime.xaml");
+					uris[3] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Green.xaml");
+					break;
+
+				case 2:
+					uris[0] = new Uri("pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Dark.xaml");
+					uris[2] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepOrange.xaml");
+					uris[3] = new Uri("pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Orange.xaml");
+					break;
+			}
+
+			Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = uris[0] });
+			Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = uris[1] });
+			Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = uris[2] });
+			Resources.MergedDictionaries.Add(new ResourceDictionary() { Source = uris[3] });
+
+		}
+
 	}
 }
diff --git a/Magazyn_Client/Magazyn/Magazyn.csproj b/Magazyn_Client/Magazyn/Magazyn.csproj
index 5c4a801..939a4e8 100644
--- a/Magazyn_Client/Magazyn/Magazyn.csproj
+++ b/Magazyn_Client/Magazyn/Magazyn.csproj
@@ -133,7 +133,9 @@
     </None>
   </ItemGroup>
   <ItemGroup>
-    <None Include="App.config" />
+    <None Include="App.config">
+      <SubType>Designer</SubType>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Resource Include="Images\add.png" />
diff --git a/Magazyn_Client/Magazyn/MainWindow.xaml b/Magazyn_Client/Magazyn/MainWindow.xaml
index aa7ac06..d123409 100644
--- a/Magazyn_Client/Magazyn/MainWindow.xaml
+++ b/Magazyn_Client/Magazyn/MainWindow.xaml
@@ -23,6 +23,7 @@
 		<Label Content="Lista owoców:" FontWeight="Bold" HorizontalAlignment="Left" Margin="10,4,0,0" VerticalAlignment="Top" Width="100"/>
 		<Button x:Name="prevButton" Content="Poprzednia" HorizontalAlignment="Left" Margin="10,0,0,52" VerticalAlignment="Bottom" Width="105" Click="prevButton_Click"/>
 		<Button x:Name="nextButton"  Content="Następna" HorizontalAlignment="Right" Margin="0,0,10,52" VerticalAlignment="Bottom" Width="105" Click="nextButton_Click"/>
+		<Button Name="themeButton" Content="Theme" Margin="10,0,0,10" VerticalAlignment="Bottom" Height="35" HorizontalAlignment="Left" Width="80" Click="themeButton_Click"/>
 
 
 	</Grid>
diff --git a/Magazyn_Client/Magazyn/MainWindow.xaml.cs b/Magazyn_Client/Magazyn/MainWindow.xaml.cs
index fda40b9..2a10ec6 100644
--- a/Magazyn_Client/Magazyn/MainWindow.xaml.cs
+++ b/Magazyn_Client/Magazyn/MainWindow.xaml.cs
@@ -25,6 +25,8 @@ namespace Magazyn
 {
 	public partial class MainWindow : Window
 	{
+		int i = 0;
+
 		public int size = 4;
 		public int page = 0;
 
@@ -152,6 +154,12 @@ namespace Magazyn
 			this.size = (int)(height / 90);
 			RefreshListOfFruits();
 		}
+
+		private void themeButton_Click(object sender, RoutedEventArgs e)
+		{
+			var app = App.Current as App;
+			app.ChangeTheme(i++);
+		}
 	}
 }