diff --git a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
index 8e892ffc21..b22962115e 100644
--- a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
+++ b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
@@ -59,6 +59,8 @@ namespace Avalonia.Platform
         /// </summary>
         Action<double> ScalingChanged { get; set; }
 
+        Action<WindowTransparencyLevel> TransparencyLevelChanged { get; set; }
+
         /// <summary>
         /// Creates a new renderer for the toplevel.
         /// </summary>
diff --git a/src/Avalonia.Controls/TopLevel.cs b/src/Avalonia.Controls/TopLevel.cs
index 8861c72418..3ac5779ed3 100644
--- a/src/Avalonia.Controls/TopLevel.cs
+++ b/src/Avalonia.Controls/TopLevel.cs
@@ -6,6 +6,7 @@ using Avalonia.Input.Raw;
 using Avalonia.Layout;
 using Avalonia.Logging;
 using Avalonia.LogicalTree;
+using Avalonia.Media;
 using Avalonia.Platform;
 using Avalonia.Rendering;
 using Avalonia.Styling;
@@ -14,6 +15,7 @@ using JetBrains.Annotations;
 
 namespace Avalonia.Controls
 {
+
     /// <summary>
     /// Base class for top-level widgets.
     /// </summary>
@@ -49,6 +51,12 @@ namespace Avalonia.Controls
         public static readonly StyledProperty<WindowTransparencyLevel> TransparencyLevelProperty =
             AvaloniaProperty.Register<TopLevel, WindowTransparencyLevel>(nameof(TransparencyLevel), WindowTransparencyLevel.None);
 
+        /// <summary>
+        /// Defines the <see cref="Background"/> property.
+        /// </summary>
+        public static readonly StyledProperty<IBrush> TransparencyBackgroundFallbackProperty =
+            AvaloniaProperty.Register<TopLevel, IBrush>(nameof(TransparencyBackgroundFallback), Brushes.White);
+
         private readonly IInputManager _inputManager;
         private readonly IAccessKeyHandler _accessKeyHandler;
         private readonly IKeyboardNavigationHandler _keyboardNavigationHandler;
@@ -56,6 +64,7 @@ namespace Avalonia.Controls
         private readonly IGlobalStyles _globalStyles;
         private Size _clientSize;
         private ILayoutManager _layoutManager;
+        private Border _transparencyFallbackBorder;
 
         /// <summary>
         /// Initializes static members of the <see cref="TopLevel"/> class.
@@ -117,6 +126,7 @@ namespace Avalonia.Controls
             impl.Paint = HandlePaint;
             impl.Resized = HandleResized;
             impl.ScalingChanged = HandleScalingChanged;
+            impl.TransparencyLevelChanged = HandleTransparencyLevelChanged;
 
             _keyboardNavigationHandler?.SetOwner(this);
             _accessKeyHandler?.SetOwner(this);
@@ -173,6 +183,12 @@ namespace Avalonia.Controls
             set { SetValue(TransparencyLevelProperty, value); }
         }
 
+        public IBrush TransparencyBackgroundFallback
+        {
+            get => GetValue(TransparencyBackgroundFallbackProperty);
+            set => SetValue(TransparencyBackgroundFallbackProperty, value);
+        }
+
         public ILayoutManager LayoutManager
         {
             get
@@ -330,6 +346,21 @@ namespace Avalonia.Controls
             LayoutHelper.InvalidateSelfAndChildrenMeasure(this);
         }
 
+        protected virtual void HandleTransparencyLevelChanged(WindowTransparencyLevel transparencyLevel)
+        {
+            if(_transparencyFallbackBorder != null)
+            {
+                if(transparencyLevel == WindowTransparencyLevel.None)
+                {
+                    _transparencyFallbackBorder.Background = TransparencyBackgroundFallback;
+                }
+                else
+                {
+                    _transparencyFallbackBorder.Background = Brushes.Transparent;
+                }
+            }
+        }
+
         /// <inheritdoc/>
         protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
         {
@@ -339,6 +370,15 @@ namespace Avalonia.Controls
                 $"Control '{GetType().Name}' is a top level control and cannot be added as a child.");
         }
 
+        protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+        {
+            base.OnApplyTemplate(e);
+
+            _transparencyFallbackBorder = e.NameScope.Find<Border>("PART_TransparencyFallback");
+
+            HandleTransparencyLevelChanged(PlatformImpl.TransparencyLevel);
+        }
+
         /// <summary>
         /// Raises the <see cref="Opened"/> event.
         /// </summary>
diff --git a/src/Avalonia.Themes.Default/EmbeddableControlRoot.xaml b/src/Avalonia.Themes.Default/EmbeddableControlRoot.xaml
index 1fd168c009..3acab7d7bc 100644
--- a/src/Avalonia.Themes.Default/EmbeddableControlRoot.xaml
+++ b/src/Avalonia.Themes.Default/EmbeddableControlRoot.xaml
@@ -3,13 +3,15 @@
   <Setter Property="FontSize" Value="{DynamicResource FontSizeNormal}"/>
   <Setter Property="Template">
     <ControlTemplate>
-      <Border Background="{TemplateBinding Background}">
-        <VisualLayerManager>
-          <ContentPresenter Name="PART_ContentPresenter" 
-                            ContentTemplate="{TemplateBinding ContentTemplate}"
-                            Content="{TemplateBinding Content}" 
-                            Margin="{TemplateBinding Padding}"/>
-        </VisualLayerManager>
+      <Border Name="PART_TransparencyFallback">
+        <Border Background="{TemplateBinding Background}">
+          <VisualLayerManager>
+            <ContentPresenter Name="PART_ContentPresenter"
+                              ContentTemplate="{TemplateBinding ContentTemplate}"
+                              Content="{TemplateBinding Content}"
+                              Margin="{TemplateBinding Padding}"/>
+          </VisualLayerManager>
+        </Border>
       </Border>
     </ControlTemplate>
   </Setter>
diff --git a/src/Avalonia.Themes.Default/OverlayPopupHost.xaml b/src/Avalonia.Themes.Default/OverlayPopupHost.xaml
index 56b3699c07..e57325499d 100644
--- a/src/Avalonia.Themes.Default/OverlayPopupHost.xaml
+++ b/src/Avalonia.Themes.Default/OverlayPopupHost.xaml
@@ -2,13 +2,15 @@
   <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}"/>
   <Setter Property="Template">
     <ControlTemplate>
-      <VisualLayerManager IsPopup="True">
-        <ContentPresenter Name="PART_ContentPresenter"
-                          Background="{TemplateBinding Background}"
-                          ContentTemplate="{TemplateBinding ContentTemplate}"
-                          Content="{TemplateBinding Content}" 
-                          Padding="{TemplateBinding Padding}"/>
-      </VisualLayerManager>
+      <Border Name="PART_TransparencyFallback">
+        <VisualLayerManager IsPopup="True">
+          <ContentPresenter Name="PART_ContentPresenter"
+                            Background="{TemplateBinding Background}"
+                            ContentTemplate="{TemplateBinding ContentTemplate}"
+                            Content="{TemplateBinding Content}"
+                            Padding="{TemplateBinding Padding}"/>
+        </VisualLayerManager>
+      </Border>
     </ControlTemplate>
   </Setter>
 </Style>
diff --git a/src/Avalonia.Themes.Default/PopupRoot.xaml b/src/Avalonia.Themes.Default/PopupRoot.xaml
index cf063f5390..1a55d2f7a4 100644
--- a/src/Avalonia.Themes.Default/PopupRoot.xaml
+++ b/src/Avalonia.Themes.Default/PopupRoot.xaml
@@ -2,13 +2,15 @@
   <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}"/>
   <Setter Property="Template">
     <ControlTemplate>
-      <VisualLayerManager IsPopup="True">
-        <ContentPresenter Name="PART_ContentPresenter"
-                          Background="{TemplateBinding Background}"
-                          ContentTemplate="{TemplateBinding ContentTemplate}"
-                          Content="{TemplateBinding Content}" 
-                          Padding="{TemplateBinding Padding}"/>
-      </VisualLayerManager>
+      <Border Name="PART_TransparencyFallback">
+        <VisualLayerManager IsPopup="True">
+          <ContentPresenter Name="PART_ContentPresenter"
+                            Background="{TemplateBinding Background}"
+                            ContentTemplate="{TemplateBinding ContentTemplate}"
+                            Content="{TemplateBinding Content}"
+                            Padding="{TemplateBinding Padding}"/>
+        </VisualLayerManager>
+      </Border>
     </ControlTemplate>
   </Setter>
 </Style>
diff --git a/src/Avalonia.Themes.Default/Window.xaml b/src/Avalonia.Themes.Default/Window.xaml
index 2a8b5d0fca..e29409e894 100644
--- a/src/Avalonia.Themes.Default/Window.xaml
+++ b/src/Avalonia.Themes.Default/Window.xaml
@@ -4,15 +4,17 @@
   <Setter Property="FontSize" Value="{DynamicResource FontSizeNormal}"/>
   <Setter Property="Template">
     <ControlTemplate>
-      <Border Background="{TemplateBinding Background}">
-        <VisualLayerManager>
-          <ContentPresenter Name="PART_ContentPresenter"
-                            ContentTemplate="{TemplateBinding ContentTemplate}"
-                            Content="{TemplateBinding Content}"
-                            Margin="{TemplateBinding Padding}"
-                            HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
-                            VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>           
-        </VisualLayerManager>
+      <Border Name="PART_TransparencyFallback">
+        <Border Background="{TemplateBinding Background}">
+          <VisualLayerManager>
+            <ContentPresenter Name="PART_ContentPresenter"
+                              ContentTemplate="{TemplateBinding ContentTemplate}"
+                              Content="{TemplateBinding Content}"
+                              Margin="{TemplateBinding Padding}"
+                              HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                              VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
+          </VisualLayerManager>
+        </Border>
       </Border>
     </ControlTemplate>
   </Setter>