unable to navigate to next or previous picture in full scree

Hi.

I have a problem that when I click on the images in the gallery and they go full screen, I have no navigation to go next, previous or back to gallery. I have created a sample gallery, do you know what is missing, I am using responsive image gallery and foobox.

Link to example here
https://umagotanooceano.org/alivio/

Thanks

Lars

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