CSS valid Icon

Please could someone advise me, I am currently doing an Open University
Course on Designing Websites.   I have validated my html code Ok and it told
me how to use the W3C HTML valid Logo, which I have put onto my website.
When I came to validate my CSS code I get "no error or warning found" but it
does not say it has been successful either.  From reading feedback from the
rest of your site I think my code is OK but how do I put the W3C CSS valid
Logo onto my site.  I have read the page W3c Logo and Icon Usage where it
says "refer to the W3C CSS validator page for information on use of the CSS
Validator icon.  The relevant information appears after a successful
validation" but I do not get this information!
 
Thanks for your help in this matter.

 

Regards

Alison Brown