How to center a row in page builder?

Hi guys,
first of all, thank you for the excellent plugin!

I’m having a small issue centering the row in a page.
It is a row with 3×33,3 even cells.
At the moment everything is aligned on the left.
I’m not so good with css, I tried to add

margin: 0 auto !important

, it will center the row but at the same time resize the images (they become smaller).
If I “inspect element” I can see that there are margins and paddings set.
When I try to uncheck them, the pictures go to the center but keep resizing.

any suggestion?
Thank you!

URL: http://clicksforcakes.com/blog