Hi Dustin!

my_little_forum_2.3.3.zip ⇒ forum/themes/default/style.css

Don’t forget what’s given on its top:
/***********************************************************************
* NOTICE: In order to reduce bandwidth usage, a minimized version of   *
* this stylesheet is used by default (style.min.js). Changes in this   *
* file do not have any effect unless it is loaded by the template      *
* (main.tpl).                                                          *
* The minimized version was created with the YUI Compressor            *
* <http://developer.yahoo.com/yui/compressor/>.                        *
***********************************************************************/