Apex domains cannot have CNAME records.
Question and response
Question
dig relaxfever.com. NS
Answer
relaxfever.com. 5 NS ns-1109.awsdns-10.org.
relaxfever.com. 5 NS ns-1760.awsdns-28.co.uk.
relaxfever.com. 5 NS ns-39.awsdns-04.com.
relaxfever.com. 5 NS ns-1706.awsdns-21.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0