Loader full_screen not working correctly with Datatable

I am trying to make a scrollable Datatable with a fixed header while scrolling. I have also implemented dcc.loading on the table with full_screen=True. But while loading the header does not go in the background of the loader.

It would be great if someone can point me to how I can put the header on the background of the header?

Did you find the solution of of how to show loader until the datatable gets loaded ?