With a Moodle instance setup; Change primary theme color (brandcolor) to something dark; Make a contact request from user B to user A. Make sure they're both enrolled in at least one same course together to assure they see each other. As user A, open the right 'messages' popover and acknowledge that: The little box right of the "Contacts" icon has a clear text on dark background When clicking on the "Contacts" link, the icon right of "Requests" has the same.