Apex domains cannot have CNAME records.
Question and response
Question
dig karensteward.com. NS
Answer
karensteward.com. 4 NS ns-36.awsdns-04.com.
karensteward.com. 4 NS ns-1135.awsdns-13.org.
karensteward.com. 4 NS ns-62.awsdns-07.com.
karensteward.com. 4 NS ns-1859.awsdns-40.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0