diff --git a/ModernWpf/ThemeResources/Dark.xaml b/ModernWpf/ThemeResources/Dark.xaml
index 7dd711d3..d85fa92e 100644
--- a/ModernWpf/ThemeResources/Dark.xaml
+++ b/ModernWpf/ThemeResources/Dark.xaml
@@ -228,8 +228,8 @@
     <Color x:Key="ControlSolidFillColorDefault">#454545</Color>
 
     <Color x:Key="SubtleFillColorTransparent">#00FFFFFF</Color>
-    <Color x:Key="SubtleFillColorSecondary">#08FFFFFF</Color>
-    <Color x:Key="SubtleFillColorTertiary">#0FFFFFFF</Color>
+    <Color x:Key="SubtleFillColorSecondary">#0AFFFFFF</Color>
+    <Color x:Key="SubtleFillColorTertiary">#04FFFFFF</Color>
     <Color x:Key="SubtleFillColorDisabled">#00FFFFFF</Color>
 
     <Color x:Key="ControlAltFillColorTransparent">#00FFFFFF</Color>
diff --git a/ModernWpf/ThemeResources/Light.xaml b/ModernWpf/ThemeResources/Light.xaml
index a9fdcc1c..917f4969 100644
--- a/ModernWpf/ThemeResources/Light.xaml
+++ b/ModernWpf/ThemeResources/Light.xaml
@@ -229,7 +229,7 @@
 
     <Color x:Key="SubtleFillColorTransparent">#00FFFFFF</Color>
     <Color x:Key="SubtleFillColorSecondary">#06000000</Color>
-    <Color x:Key="SubtleFillColorTertiary">#0A000000</Color>
+    <Color x:Key="SubtleFillColorTertiary">#03000000</Color>
     <Color x:Key="SubtleFillColorDisabled">#00FFFFFF</Color>
 
     <Color x:Key="ControlAltFillColorTransparent">#00FFFFFF</Color>