Author comment highlighting was never been easyer. I tryed Matt`s technique but it didn’t work because I didn’t find the in my comments.php, so I looked for another way of changing the background color of my author comments in WordPress 2.8.4

You see, as from WordPress 2.7 the developers introduced a special author comment list class that is available only to the author comments. So this means that we will have to set up a css color tag on that class just like in Matt`s example.

So head on and open up your style.css and paste this code:

.bypostauthor {
background-color: #dafbd4 !important;
}