XF 1.5 Designate a color for a specific user

Hi !
I would like to know how in the extra.css put a fair color to one person without creating a guard, just with the ID of his account.

ID exemple :

Tanks :)


Active member
This would be more accurate and prevent any other possible users from being changed:

a[href*=".38974/"].username {
    color: red !important