Apex domains cannot have CNAME records.
Question and response
Question
dig intros.gr. NS
Answer
intros.gr. 4 NS colette.ns.cloudflare.com.
intros.gr. 4 NS ashton.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0