Apex domains cannot have CNAME records.
Question and response
Question
dig gardbrasil.org. NS
Answer
gardbrasil.org. 5 NS ns-1894.awsdns-44.co.uk.
gardbrasil.org. 5 NS ns-946.awsdns-54.net.
gardbrasil.org. 5 NS ns-324.awsdns-40.com.
gardbrasil.org. 5 NS ns-960.awsdns-56.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0