Apex domains cannot have CNAME records.
Question and response
Question
dig tarhely.eu. NS
Answer
tarhely.eu. 5 NS ns03.tarhely.eu.
tarhely.eu. 5 NS ns01.tarhely.eu.
tarhely.eu. 5 NS ns02.tarhely.eu.
Authority
The response has no authority records.
Additional
ns01.tarhely.eu. 5 A 185.51.188.4
ns02.tarhely.eu. 5 A 79.172.252.4
ns03.tarhely.eu. 5 A 195.201.215.228
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0