More specific selector

Otherwise toggle are in black as well.

wiki/src/install/inc/stylesheets/assistant.css

@@ -65,7 +65,7 @@ span.title {
   padding-top: 20px;
 }
 
-#pagebody #content a {
+#pagebody #content .panel a {
   color: black !important;
   border-bottom: 0px !important;
 }