Support How to build [Owner] my_name in user group xenforo?

[Cimas]

I want to know how to make it can you guys help me?

My code :

text-shadow: 0px 2px 7px #f00;
color: #f90;
font-weight: bold;

.rf_owner {
    text-shadow: 1px 1px 5px #000;
    color: #f90;
    font-weight: 900;
    white-space: nowrap;
}
.rf_o {
    white-space: nowrap;
}
.rf_o:before {
    content: "[Owner] ";
    color: #a50000;
    font-weight: bold;
    font-style: normal;
}

is there something wrong?

 

[MiooMoo]

My code :

I don't think it can be done in css code