Apex domains cannot have CNAME records.
Question and response
Question
dig coolletics.com. NS
Answer
coolletics.com. 5 NS ns-1679.awsdns-17.co.uk.
coolletics.com. 5 NS ns-407.awsdns-50.com.
coolletics.com. 5 NS ns-412.awsdns-51.com.
coolletics.com. 5 NS ns-1533.awsdns-63.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0