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Validation by uri (http://www.dusevnevlastnictvo.gov.sk/resource/vpdv.css) failes with 3 errors, but validates by direct imput source of the same css file.
http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.dusevnevlastnictvo.gov.sk%2Fresource%2Fvpdv.css&profile=css21&usermedium=all&warning=1&lang=en works for me. No error.