Apex domains cannot have CNAME records.
Question and response
Question
dig webnode.com. NS
Answer
webnode.com. 4 NS ns-1582.awsdns-05.co.uk.
webnode.com. 4 NS ns-607.awsdns-11.net.
webnode.com. 4 NS ns-13.awsdns-01.com.
webnode.com. 4 NS ns-1517.awsdns-61.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0