if you look at the source of the page and find the area in question you will see this (this is not complete and I formated it to make it easier to read)
HTML Code:
<td id="sidebarunten_2" align="left" valign="top">
<div id="recent-comments-2" class="widget widget_recent_comments">
<div class="widget-title"><h3>Letzte Kommentare</h3></div>
<ul id="recentcomments">
<li class="recentcomments">zebra1971 bei
<a href="http://fabforties.de/schonheit/gesichtspflege/korres-quercetin-oak-anti-ageing-aufbaucreme-fur-olige-haut/comment-page-1/#comment-35">Korres Quercetin & Oak Anti-Ageing Aufbaucreme für ölige Haut</a>
</li>
<li class="recentcomments">Irit bei
<a href="http://fabforties.de/schonheit/makeup/neu-bobbi-brown-smoky-sultry-smoldering-collection/comment-page-1/#comment-29">Neu: Bobbi Brown Choose Your Glam Smoky, Sultry, Smoldering Collection</a>
</li>
now you use teh elements, ID's and Classes to write your selector and then the rules. To select the links you could create a selector
HTML Code:
td#sidebarunten_2 div#recent-comments-2 ul#recentcomments li.recentcomments a {
then add the rule for the color you want. This is the long form and could be abbreviated. because an ID can only occur once on a page, you should be able to reduce the selector to
HTML Code:
ul#recentcomments li.recentcomments a
or
HTML Code:
#recentcomments li a