Notifications And Share Location flyouts/overlays in browsers(Chrome/Firefox) not keyboard accessible

Hi,
    All modern browsers now have in this new built popup or flyouts for enabling  Push Notifications And Share Location to match the features we see in mobile devices. But the overlays and pops are unfortunately not keyboard navigable. How to handle this? Is there anyway we can override this and implement working and accessible alternative?

Ex: The close ‘X’ button on the overlay.

[cid:D44EE34C-42E2-41A7-93FC-35F1D47E834B]

[cid:85A1F2F9-FFF7-4877-84FE-E6E464663A7C]

Thank you,
Ashraf