Apex domains cannot have CNAME records.
Question and response
Question
dig cecilfung.org. NS
Answer
cecilfung.org. 4 NS ns-1680.awsdns-18.co.uk.
cecilfung.org. 4 NS ns-719.awsdns-25.net.
cecilfung.org. 4 NS ns-1607.awsdns-08.co.uk.
cecilfung.org. 4 NS ns-1861.awsdns-40.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0