@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document url-prefix('http://www.tumblr.com/'), url-prefix('https://www.tumblr.com/')   {

.post_avatar {
  background-color: transparent !important;
}
.post_avatar_link, .post_sub_avatar {
  -webkit-border-radius:50px !important;
  -moz-border-radius:50px !important;
  border-radius:50px !important;
}

}