CSS change JA Social Template, Joomla 2.5

I am using JA Social template on Joomla 2.5. The content spacing in the CSS defines a 15px margin spacing for most of the content including tables. The 15px margin displays tables with too much space like below. The requirement is to introduce/modify the CSS for table entries to override the 15px margin to 0px. Please only bid if you are familiar with JA templates and T3 architecture, as it is not as simple as using Firebug to identify the CSS because of the way the CSS is recompiled. Currently Needs to be Table Entry 1 Table Entry 1 Table Entry 2 Table Entry 3 Table Entry 2 Table Entry 3