Apex domains cannot have CNAME records.
Question and response
Question
dig rigatobeppino.com. NS
Answer
rigatobeppino.com. 5 NS ns-1344.awsdns-40.org.
rigatobeppino.com. 5 NS ns-377.awsdns-47.com.
rigatobeppino.com. 5 NS ns-700.awsdns-23.net.
rigatobeppino.com. 5 NS ns-1190.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0