Extra empty lightbox div after footer

There is an extra empty lightbox div after the footer section in my wordpress theme which is hidden (display: none).

How can find the place an element has been defined so I can modify or delete it?

I use a cache plugin for my website, but surprisingly in the source section of Google Chrome the mentioned lightbox div comes after the cache plugin comment.

How can I define something like that?

Sorry for my bad English and Thanks for you help

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