How do I put CSS files into gmod?

I’ve been tryign to get CCS stuff for my gmod, but google has failed me. Is there anyone here who has the CCS files or can teach how to get them without buying them from steam?

You have to buy it.

add “AdditionalContentID 240” under “File system” in your mod`s gameinfo.txt

edit: i missed the “g” in your post so i agree with toaster468