alignment

Hi there and sorry if its a trivial issue, but haven't found anything after a day of searching.

I use a Panel as the front page, whose layout consists of several rows and coloumns. One of the rows has three coloumns, each with a single image as content (within another row of course). Now, the problem is, I need the left one to align left, the center to center, and the right one to the right. By default, they align left. I suspect the job should be done by applying a "CSS style" as region style, but I can't do CSS and haven't found any examples. Thanks for your help and much appreciated.