#wup-availability-msg.wup-error {
  margin: .5em 0 0;
  padding: .5em .75em;
  border-left: 4px solid #cc1818;
  background: #ffecec;
}
#wup-availability-msg.wup-ok {
  margin: .5em 0 0;
  padding: .5em .75em;
  border-left: 4px solid #46b450;
  background: #eef9f0;
}
button.single_add_to_cart_button.disabled { opacity: .6; cursor: not-allowed; }