Trouble centering gallery on page.

Hello!

I’m trying to create a page for my photography, but it seems no matter what I do it wants to align the gallery to the left. The ‘thumbnail grid’ gallery option seemed to center just fine. I prefer the ’tiled mosaic’ option. Is there a part of the theme I could overwrite or rewrite to change this? I really only need it for the one page. ??

Here’s a link for reference:
https://zeebam.com/photography/

Thanks!