Portrait mobile mode

Good afternoon Support,
I’d like to know if there is a way for my Nifty images to appear in portrait mode
on a mobile device naturally.

As of now they only appears in landscape mode until the phone is turned to landscape.

Would there be a way to add the 1080 x 1920 under each image to have both??

Thanks again.

The page I need help with: [log in to see the link]