Request User name with effect

[R3GN]

Hi, I want to make moving usernames by user groups. The usernames of those in the admin group will flash red. New members will change color with RGB colors. How can I do this?

 

[XenForo]

.username--style3 {
  text-shadow: #ee82ee 1px 1px 10px;
  color: red;
  background: url('https://xnforo.ir/16066101745881.gif');