This is just a simple avatar box tip. I post it here since I don't see any place better than this for the time being.
You just need to add this css code to either index.css or variant css.
.board_avatar .avatar, #basicinfo .avatar {
border: 1px solid #ddd;
padding: 4px;
background: #fff;
}
I prefer a white background for avatar, but you may change or remove it to suit your theme.
And that is it. :)
Or even better custom.css! ;D
And I totally forget about that.
Anyway, this can easily be extended to the display / pm page as well. I even add max-width to it as I don't want avatar to be too big in display / pm page.