Valid CSS

I used the (X)HTML validator for a .html file that I had made and it passed 
for XHTML 1.1 strict. It them allowed me to display an image on that page 
that said I had used valid XHTML 1.1 code.
Then I used the CSS validator to validate a .css file that I had made, it 
passed for valid CSS Level 2. However, it did not say that I could display 
an image to state that I had used valid CSS. I did not think anything of 
this until I saw the image for valid CSS at the bottom of the page, so I was 
wondering, did someone just "forget" to say that people could display the 
image, or is it an image that just the W3C use.

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