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