Apex domains cannot have CNAME records.
Question and response
Question
dig craigslisit.org. NS
Answer
craigslisit.org. 5 NS ns-933.awsdns-52.net.
craigslisit.org. 5 NS ns-157.awsdns-19.com.
craigslisit.org. 5 NS ns-1866.awsdns-41.co.uk.
craigslisit.org. 5 NS ns-1711.awsdns-21.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0