Declaring Character Set in CSS File
By default, CSS file is assumed to be UTF-8 encoded, unless the server or other mechanism says otherwise.
However, you can declare it in your CSS file, by putting the following in the first line:
For a introduction on Unicode, see: Unicode Basics: What's Character Set, Character Encoding, UTF-8?
〔Declaring character encodings in CSS By W3C. At http://www.w3.org/International/questions/qa-css-charset.en.php〕