CSS validating and Democracy

Democracy is having a problem with CSS validaton on my website. See here for errors.

this is what it says:

URI : http://spinalalignment.com/wp-content/plugins/democracy/basic.css
69 * html .dem-graph a i, * html .dem-graph a:hover b Parse Error – opacity=0)
74 * html .dem-graph a:hover i Parse Error – opacity=100)

Anyone have a suggestion on how to correct?
Thanks.