Username Effect Coding

So, I am attempting to add in a special effect to one of the staff on my server 
It is a bubble effect and it looks like this https://2img.net/h/oi59.tinypic.com/of95x5_th.gif
However, I do not know how to add it in... I know it is possible because my friend was able to do it. 
So if anyone can help me out that would be appreciated

Do you mean the group title, the members in the group, or just one member?

Just one member. 
Say I wanted to give just one member a sparkly username... how would I add that?

CSS Stylesheet:

Code:

a[href="/MEMBER ID"] {
    background: url("IMAGE URL");
}

member ID is the last part in the browser link:  u1, u100, or u550.

Okay thank you!

Is this solved?

I believe so