Fullscreen z-index not covering when using tab widget

Thanks @francismak, I've been able to reproduce this consistently. I had to also install the field_group module to test (not sure if that was omitted or you achieved the layout in a different way).

I do think the selector's specificity is higher than it needs to be however - I was able to resolve without the inclusion of #block-claro-content. Can you confirm?

Thanks again!

Thx for the input. At first I was not sure if this is a particular case for claro theme or not, that's why.
I do agree that make it more generic, could benefit for other users using different theme.

Attached with revised patch.

This is great, thank you! Merged and will be in 1.0.0-beta6