lowering the exit sign (x) in image lightbox.

I have an issue with the exit sign (X) in my gallery page. When you click on an image it expands in lightbox mode but to exit the lightbox and go back to the gallery you need to click the x symbol which is way at the top of the page. I'm thinking most people won't think to scroll all the way up to find it, so I'm wondering if there's some code i can apply to bring it down closer to the image?

I don't know anything about code so any help would be much appreciated!!