I'm using The Columnist and the home page of my site currently has 4 columns. In each column is an image and title for an article, but the images are smaller than I'd like. I would like to reduce the number of columns to 2 possibly 3, to increase the size of those front page images for a more visually pleasing design. I'm very new to wordpress, can someone advise me on what to add to the style sheet in order to accomplish this?
The blog I need help with is broadstreetonline.org.