Apex domains cannot have CNAME records.
Question and response
Question
dig brainofbritain.com. NS
Answer
brainofbritain.com. 4 NS ns-2.awsdns-00.com.
brainofbritain.com. 4 NS ns-66.awsdns-08.com.
brainofbritain.com. 4 NS ns-330.awsdns-41.com.
brainofbritain.com. 4 NS ns-1596.awsdns-07.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0