Can't generate a lexer for CSS String

[beatak]

I'm trying to implement CSS parser using Jison project. I found CSS2.1 definition here, but the lexer keeps failing and I don't know why. Here's a test case.

https://gist.github.com/beatak/0b8b29fbddc0a28ddad2

I'm new to this area and it might be me doing totally wrong, but if you could comment how to solve this (like "you're doing it wrong, read Bison intro"), that will be super appreciated. Thanks!