diff --git a/src/Semi.Avalonia/Themes/Light/DateTimePickerShared.axaml b/src/Semi.Avalonia/Themes/Light/DateTimePickerShared.axaml
index cd685fb..fe2e53e 100644
--- a/src/Semi.Avalonia/Themes/Light/DateTimePickerShared.axaml
+++ b/src/Semi.Avalonia/Themes/Light/DateTimePickerShared.axaml
@@ -25,4 +25,6 @@
     <SolidColorBrush x:Key="DateTimePickerButtonDisabledBorderBrush" Color="Transparent" />
     <SolidColorBrush x:Key="DateTimePickerButtonDisabledBackground" Opacity="0.02" Color="#2E3238" />
     <SolidColorBrush x:Key="DateTimePickerButtonDisabledIconForeground" Opacity="0.4" Color="#2E3238" />
+    
+    <BoxShadows x:Key="DateTimePickerFlyoutBoxShadow">0 0 8 0 #1A000000</BoxShadows>
 </ResourceDictionary>
\ No newline at end of file