diff --git a/src/Calculator/Views/DateCalculator.xaml b/src/Calculator/Views/DateCalculator.xaml
index 3d088ab6..23c1ca6a 100644
--- a/src/Calculator/Views/DateCalculator.xaml
+++ b/src/Calculator/Views/DateCalculator.xaml
@@ -1023,7 +1023,12 @@
                             <StaticResource x:Key="ComboBoxBackgroundUnfocused" ResourceKey="SubtleFillColorTransparentBrush"/>
                             <StaticResource x:Key="ComboBoxBackgroundFocused" ResourceKey="SubtleFillColorTransparentBrush"/>
                         </ResourceDictionary>
-                        <ResourceDictionary x:Key="HighContrast"/>
+                        <ResourceDictionary x:Key="HighContrast">
+                            <StaticResource x:Key="ComboBoxBackgroundPointerOver" ResourceKey="SubtleFillColorSecondaryBrush"/>
+                            <StaticResource x:Key="ComboBoxBackgroundPressed" ResourceKey="SubtleFillColorTertiaryBrush"/>
+                            <StaticResource x:Key="ComboBoxBackgroundUnfocused" ResourceKey="SubtleFillColorTransparentBrush"/>
+                            <StaticResource x:Key="ComboBoxBackgroundFocused" ResourceKey="SubtleFillColorTransparentBrush"/>
+                        </ResourceDictionary>
                     </ResourceDictionary.ThemeDictionaries>
                 </ResourceDictionary>
             </ComboBox.Resources>