XF 1.5 Why are not my username CSS working?

[Bendik0208]

Hello, so I have try so many times to get my CSS to work, but it never work...
I don't know why..


https://gyazo.com/5fbbe124d28eed5917c2508bf0738988

color: #ffffff;
font-weight: bold;
border-radius: 5px;
background-color: #e60000;
}