if you use chrome you can right mouse click on particular element and find out exactly which rule is taking over color with "inspect element"
btw .something in html is class="something"
id="someid" in css marked such as #someid
id > class
edit, a:sponsors is way out of line, simply wrong , it's used to set properties for a:visited, a:link, a:active
you can do a.sponsor:visited for exemple
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