Apex domains cannot have CNAME records.
Question and response
Question
dig website-superhero.com. NS
Answer
website-superhero.com. 4 NS ns-701.awsdns-23.net.
website-superhero.com. 4 NS ns-355.awsdns-44.com.
website-superhero.com. 4 NS ns-1923.awsdns-48.co.uk.
website-superhero.com. 4 NS ns-1459.awsdns-54.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0