Shadow box applied to menu not displaying

hello

I’m playing around with shadow box. I’ve added a shadow to the NavMenu thats included with the standard navbar element. I can see the shadow in the designer but when I preview the design, the shadow box disappears when the menu is fully open. You can see the shadow as the menu animates out but then goes away. Is there a simple fix for this? I’m curious if anyone have ran into this issue and have a fix for this. I dont want to build a custom menu and hoping there is a simple fix.

Here is a link to view project :
https://preview.webflow.com/preview/lassogen?utm_medium=preview_link&utm_source=designer&utm_content=lassogen&preview=a3a0dd0855cdfd557ca58a646993034b&workflow=preview

Here is my site Read-Only:

hi @hnguyen here is tip for element you can revisit and write custom code to overwrite it.

hi @hnguyen if you do not need further help with your request feel free to close your request.