How to make image columns stick together?

In this example: http://themes.muffingroup.com/be/actor/gallery/
the images in the gallery are sticking together, in other words, there is no white space between the pictures.

I am working on a website locally in MAMP now, and i'm trying to get some images next to each other in the same way as the example i gave, but I really can't figure out how to do this.. So my question is, what is making the images in the example stick together without the white space?
Thanks for reading my question.
Greetings from Holland.

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