http://themoralvegetarian.com/search-by/ I have installed

http://themoralvegetarian.com/search-by/

I have installed this plugin:
http://wordpress.org/plugins/query-multiple-taxonomies/

Instead of one long column, I’d like it to have 3 colums across the plugin. Do you have any idea what custom css I use to get it to do that?

Thanks in advance for your time.