Apex domains cannot have CNAME records.
Question and response
Question
dig citycdn.fi. NS
Answer
citycdn.fi. 5 NS charles.ns.cloudflare.com.
citycdn.fi. 5 NS joan.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0