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The css z-index
of your header and footer might be higher than the z-index
of the overlay mask.
Try inspecting the elements and evaluate their z-index
values, try forcing new values to ensure that the z-index
of the header and footer is a lower value than the grey overlay mask.
The issue might be the lack of a z-index
value on some of those elements to indicate which should appear over the top of another.
Source:stackexchange.com