diff --git a/modules/basic-theme/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo.csproj b/modules/basic-theme/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo.csproj
index dca7a19065..489676488d 100644
--- a/modules/basic-theme/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo.csproj
+++ b/modules/basic-theme/test/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Demo.csproj
@@ -18,4 +18,10 @@
     <ProjectReference Include="..\..\src\Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic\Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Pages\**\*.css">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+  
 </Project>