How do I make a placeholder for a 'select' box?

I'm using placeholders for text inputs which is working out just fine. But I'd like to use a placeholder for my selectboxes as well. Of course I can just use this code: <select> <option value="">Select your option</option> <option value="hurr">Durr</option> </select> But the 'Select your option' is in black instead of lightgrey. So my solution could possibly be CSS-based. jQuery is fine too. This

[o_ti]

disabledとselectedの併用でselect要素のplaceholderらしきものを表現する