CSS3 and border-radius

Karel Profant <[email protected]>
Newsgroups gmane.org.w3c.validator.css
Message-ID <[email protected]> 
Dear CSS validator workers,
I make my "http://czechsatelit.sweb.cz/" with CSS element "border-radius: 20px" in "http://czechsatelit.sweb.cz/web/css/style.css". I take this website to CSS3 validator and ... look at this: "http://jigsaw.w3.org/css-validator/validator?uri=czechsatelit.sweb.cz%2F&profile=css3&usermedium=all&warning=2&lang=cs". I want this website without CSS errors. What I must add to my website?
Thank you
Karel Profant
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