A great tool for this would be to download FireFox, and then install the Fire-bug plug-in. This then allows you to right click on any item within the page, and "INSPECT" the object. This then shows you all the styles which affect the object, and whioch stylesheets and lines are influencing the style.
With your specific text, you may want to look at td.cartProductDisplay, which you would need to add to your stylesheet. You may also want to add anchor tags to the declaration, and mark it as important, if it is link text you want to over-ride the size of.
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