Is Username CSS styling broken?

[XFFA.IR Bot]

None of my CSS edits are working on "User name CSS" under user groups. I've tried this on the default and 2 custom themes.

Example 1 (Extra.css):

.username .style7 {
padding: 5;
font-family: Nintendoid1;
color: #eee;
font-size: 0.62em;
line-height: 1;
text-shadow: 0.06rem 0 0.06rem #ea36af, -0.125rem 0 0.06rem #75fa69;
letter-spacing: 0.125em;
animation-duration: 0.01s;
animation-name: textflicker;
animation-iteration-count: infinite;
animation-direction...
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