Apex domains cannot have CNAME records.
Question and response
Question
dig webside.pt. NS
Answer
webside.pt. 4 NS ns2.webside.pt.
webside.pt. 4 NS ns.webside.pt.
Authority
The response has no authority records.
Additional
ns.webside.pt. 4 A 62.48.131.10
ns2.webside.pt. 4 A 62.48.131.11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0