i had this same issue.
here’s what i did:
in /your-theme-folder/topic.php make these changes
<?php
//get user id
$user_id = get_post_author_id();
//get user role
$role = get_user_type($user_id);
// if user is a key master or Administrator add css class
if ($role == 'Key Master' || $role == 'Administrator') {
$adminclass = "class='adminpost'";
}
//otherwise don't add a class
else {
$adminclass = "";
}
?>
<!--add your css class to the li tag-->
<li id="post-<?php post_id(); ?>" <?php echo $adminclass; ?>>
then style your .adminpost class however you’d like.
hope that helps.
alanna