Disable zoom in Gallery Lightbox

I installed the Rife theme this week and I really like it. However, there’s something I’d like to change about the Gallery Lightbox. I don’t want people to be able to zoom in on the photo, so I want to remove both magnifying glasses and the icon next to the sharing button.

What’s the CSS code to do this? And is it also possible to change the settings of the title and caption of the photos (font, font size, space between title and caption, text background)?

Thanks in advance!

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