talk/plugins/talk-plugin-subscriber/client/components/SubscriberBadge.css

.badge {
  background-color: #616161;
  color: white;
  display: inline-block;
  padding: 5px 5px;
  border-radius: 2px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: bold;
}