Rounded avatar?

[BBNZowner]

Hi there, I've seen on a few forums people have a mod or template edit which makes all avatars rounded into a circle - I'm sure I've seen something here about it to but can't find the thread anymore.

Any idea how to do this?


I've tried editing the postbit.css as so (ive tried a few things here, heres one example):

.postbit .postuseravatarlink img {
    height: 150px;
    width: 175px;
    border-radius: 50px;
    border: 0px none;
    float: right;
}

no result
I'm still pretty useless at figuring exactly what to do for things like this haha, chances are im nowhere near the right place