Apex domains cannot have CNAME records.
Question and response
Question
dig csstrend.net. NS
Answer
csstrend.net. 4 NS ns-1357.awsdns-41.org.
csstrend.net. 4 NS ns-665.awsdns-19.net.
csstrend.net. 4 NS ns-547.awsdns-04.net.
csstrend.net. 4 NS ns-778.awsdns-33.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0