Important: never ever change anything in the standard themes files.
If you want to customize your theme (and e.g. you are using formal_white), then make your changes in the CSS files of that custom/customized theme.
Using moodle 1.8 and formal_white theme like you, I get the desired result by adding the following at the end of themes/formal_white/fw_fonts.css.
I had thought the standard theme would cascade where there wasn't an entry in the applied theme.
</b />Nancy Van Wagoner<br />
Director, Division of Continuing and Distance Education<br />
38 Crowell Drive, PO Box 118<br />
Wolfville, NS, Canada B4P 2R6<br />
800 585-6568<br />
Fax 902 585-1068<br />
<a href="mailto:firstname.lastname@example.org">email@example.com</a><br />
<b><a href="http://www.acadiau.ca/" target="_blank">Web Site </a></b></font>
<p style="text-align:right">» <a href="http://220.127.116.11/mod/glossary/view.php?g=5">ITC Membership List</a></p></td>