Apex domains cannot have CNAME records.
Question and response
Question
dig arthurflores1sh.com. NS
Answer
arthurflores1sh.com. 5 NS ns-1831.awsdns-36.co.uk.
arthurflores1sh.com. 5 NS ns-1078.awsdns-06.org.
arthurflores1sh.com. 5 NS ns-2.awsdns-00.com.
arthurflores1sh.com. 5 NS ns-1366.awsdns-42.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0