Errors in your css -embarrassing

I was using your css on my website keyparty.org and 
kept on getting validation errors on the css. 

I tried validating your sige and i am sorry to say 
thera are errors in the css. 

Hopefully those errors will be corrected asap. 

Thanks for your great validation services. :) 

The following is the relevant uri and an excerpt 
from the resulting page. 
 
http://jigsaw.w3.org/css-validator/validator?uri=http://www.w3.org/Style/CSS/

W3C CSS Validator Results for http://www.w3.org/Style/CSS/

To work as intended, your CSS style sheet needs a correct document parse
tree. This means you should use valid HTML.
Errors
URI : http://www.w3.org/Style/shadows.css

    * Line: 15 Context : div.back , div.section

      Property border-radius doesn't exist : 4em 2em
    * Line: 16 Context : div.back , div.section

      Parse Error - -moz-border-radius: 4em;
    * Line: 17 Context : div.back , div.section

      Parse error - Unrecognized : }

Warnings
URI : http://www.w3.org/Style/banner.css

    *


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