syntax error inside lightbox_alt.css?

Perhaps I'm missing something, but isn't the bottom of this declaration, the 2nd use of 'left' a syntax error?

#loading {
  height: 25%;
  width: 100%;
  text-align: center;
  line-height: 0;
  position: absolute;
  top: 40%;
  left: 45%;
  *left: 0%;  
}

That "*left: 0%;" is on line 48 of lightbox_alt.css distributed with the official release.