problem to rezise a container of thumbnails

Hello everybody,

I'm taking care of a website for a friend, and she ask me to resize the thumbnails images that you can see here (
basically the .galleria-thumbnails .galleria-image is #height: 40px #width: 60px; and I would like to put them at height: 200px; width: 400px;.

The problem is, doing that, there is an overlap between the main image and the thumbnails.
I tried to resize the all container up to 770px height ( In chrome inspect first, and It worked) but not in the css directly and I can't figure out why.

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