CSS will not validate in W3C Validator

I saw that issue was supposedly fixed but using the latest version of Drupal and of the lightbox2 module the W3C Validator returns the following:

43  	 #loading  	 Parse Error  *left: 0%;
44 	 #loading 	 Parse Error }
168 	 #overlay_default 	Property opacity doesn't exist in CSS level 2.1 but exists in [css3] : 0.6 

So I have no idea what hack *left: 0%; is for and I thought the overlay issue was being taken care of for by the jquery script.

Is this something I can move to a conditional CSS so that I can get the site to validate?