Fix some CSS validation errors
Fix some CSS validation errors

http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.libravatar.org

libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar,libravatar/libravatar