White Space under Gallery Images

Hi,

Could anyone please suggest a way of removing the large white space I have under all my gallery images?

This suggestion I found on the forum didn’t work:

.gallery-icon.landscape {
line-height: 0;
}

Here’s a page with the problem please scroll down half way. Thank you!!!

https://www.photomobil.co.il/bar-mitzvah-entertainment-idea/

Deborah