Sidebar user name styling Not my content; Don't come to me because of links not working.
In a default installation, user group user name styling does not apply to the Members Online Now block in the sidebar. To enable styling to show in this location, the sidebar_online_users template must be edited.
You can then apply styling to the user group user names as explained in the manual here:http://xenforo.com/help/user-group-styling/
However, when hovering over a user name, the underline colour from the parent <a> will be applied and may therefore differ from the text colour applied to the user name.