Portrait Images in the Gallery will not display full screen height in Google Chrome

How do i make the Portrait Images in the Gallery lightbox display full screen height in Google Chrome . They display full screen in Mozilla Firefox and MS Edge. The landscape images in the same gallery which are the same height in px's as portrait images display full screen in all 3 browsers.
Is there some css i can add to fix the issue, I have tried hidding the headers where the and title area's with the CSS dlsplay:none; but it still doesn't close the space. I have tried a number of other bit of CSS on different Items but had no luck.

https://www.brisbaneboutiquebuilders.au/index.php/clayfield-1?44
this is only a temp page i created as not to mess up the orignal page which is were the issue statred
Many Thanks Darryn

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