sliding effect cut image

hi, pardon my poor english...
as you can see in this web site

www.eurotechedilizia.com/ristrutturazioni-edili

for each image change the space from left border of the image and left border of gallery is bigger (you can see a large part of the previous image)
what can be the problem?

thanks

p.s. i tried putting only one gallery on that page with no result

Please add this in template_css.css file:

it didn't worked, i think the problem is the space between the images... but i don't know how to remove.
if you go to the page now you see the effeects of the change you suggested, tell me if i have to remove it and put something else.

furthermore i noticed that also the border ofthe thumnails isn't placed exactly around them, maybe the problem is linked to the other?
they seem both border/margin problem

thank you

I gave you wrong code, please use this instead: Please don't forget "!important".

ok, it worked

thank you very much