Apex domains cannot have CNAME records.
Question and response
Question
dig lionsmarkpens.com. NS
Answer
lionsmarkpens.com. 5 NS ns-1526.awsdns-62.org.
lionsmarkpens.com. 5 NS ns-287.awsdns-35.com.
lionsmarkpens.com. 5 NS ns-1174.awsdns-18.org.
lionsmarkpens.com. 5 NS ns-1312.awsdns-36.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0