Aligning images

I’m using theme Twenty Twelve, and I’m trying to put three 150×150 thumbnails side by side, but I can’t seem to do it. I’ve tried align, CSS float, everything I could think of. The best I got was three images across, but the center was either skewed to the left or right. Short of going to another theme, is there anything I can do? I’m going to try <BR CLEAR=”LEFT”, and Right>, next, but I don’t have a clue what this will do, I just found it in a search. https://matubbesing.com Thanks.