title: how to solve prolog in my css file?
body: <p>I have used <code>h3 {color:#333;}</code> tag in my css file. When I am checking my css file in <a href="http://validator.w3.org" rel="nofollow">http://validator.w3.org</a>, showing <code>character "h" not allowed in prolog</code>. what's the problem with my h3 tag? what is the meaning of prolog? Anybody can explain it?</p>