User blog comment:Tesla Man/User Name Colors/@comment-4902297-20130101071841

Here's what the Plants vs. Zombies Wiki uses for its .css:

a[ href= "/wiki/User:BLACK_OUT" ] { color : deepskyblue !important}

Of course, you must replace the username and color to fit the intended administrator. If you are still stuck, you can see the Plants vs. Zombies wiki css coding here.