Forum Moderators: phranque
know there are located in the left hand side, but I want to tweak them.
Are asking about the "Styles" that Word applies to its own documents? If so, then search in the Word Help files under "style" or "style_gallery" for instructions.
If this answer is off topic, please excuse, but the part of your question that I quoted above made me think you may not be talking about CSS.
On the menu, go Format > Style, which will bring up a dialog box with all the styles in use for that document.
Click on the style you want, and then click the "Modify" button.
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Note that if you want your tweaks to become permanent, then you should edit the template file--usually "normal.dot". Note .dot, not .doc :)