Apex domains cannot have CNAME records.
Question and response
Question
dig strold.io. NS
Answer
strold.io. 4 NS justin.ns.cloudflare.com.
strold.io. 4 NS dara.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0