diff --git a/demo/Ursa.Demo/Pages/DatePickerDemo.axaml b/demo/Ursa.Demo/Pages/DatePickerDemo.axaml
index 039389f..bcf1797 100644
--- a/demo/Ursa.Demo/Pages/DatePickerDemo.axaml
+++ b/demo/Ursa.Demo/Pages/DatePickerDemo.axaml
@@ -8,7 +8,7 @@
     <StackPanel Margin="20" HorizontalAlignment="Left">
         <u:CalendarView DateSelected="CalendarView_OnOnDateSelected" DatePreviewed="CalendarView_OnOnDatePreviewed"/>
         <TextBlock Text="{Binding #singlePicker.SelectedDate}" ></TextBlock>
-        <u:DatePicker Name="singlePicker" Width="200" FontSize="20"/>
-        <u:DateRangePicker Width="300" DisplayFormat="yyyyMMdd" FontSize="20" />
+        <u:DatePicker Name="singlePicker" Width="200" />
+        <u:DateRangePicker Width="300" DisplayFormat="yyyyMMdd" />
     </StackPanel>
 </UserControl>
diff --git a/src/Ursa.Themes.Semi/Controls/DatePicker.axaml b/src/Ursa.Themes.Semi/Controls/DatePicker.axaml
index eb5542a..518c63c 100644
--- a/src/Ursa.Themes.Semi/Controls/DatePicker.axaml
+++ b/src/Ursa.Themes.Semi/Controls/DatePicker.axaml
@@ -83,6 +83,7 @@
                                     <u:CalendarView
                                         Name="PART_Calendar"
                                         BorderThickness="0"
+                                        FontSize="{DynamicResource DefaultFontSize}"
                                         CornerRadius="{Binding $parent[Border].CornerRadius}"
                                         FirstDayOfWeek="{TemplateBinding FirstDayOfWeek}"
                                         IsTodayHighlighted="{TemplateBinding IsTodayHighlighted}" />
diff --git a/src/Ursa.Themes.Semi/Controls/DateRangePicker.axaml b/src/Ursa.Themes.Semi/Controls/DateRangePicker.axaml
index 9958465..dab0c1f 100644
--- a/src/Ursa.Themes.Semi/Controls/DateRangePicker.axaml
+++ b/src/Ursa.Themes.Semi/Controls/DateRangePicker.axaml
@@ -119,6 +119,7 @@
                                             Grid.Column="0"
                                             Margin="8"
                                             BorderThickness="0"
+                                            FontSize="{DynamicResource DefaultFontSize}"
                                             CornerRadius="{Binding $parent[Border].CornerRadius}"
                                             FirstDayOfWeek="{TemplateBinding FirstDayOfWeek}"
                                             IsTodayHighlighted="{TemplateBinding IsTodayHighlighted}" />
@@ -127,6 +128,7 @@
                                             Grid.Column="1"
                                             Margin="8"
                                             BorderThickness="0"
+                                            FontSize="{DynamicResource DefaultFontSize}"
                                             CornerRadius="{Binding $parent[Border].CornerRadius}"
                                             FirstDayOfWeek="{TemplateBinding FirstDayOfWeek}"
                                             IsTodayHighlighted="{TemplateBinding IsTodayHighlighted}" />