Apex domains cannot have CNAME records.
Question and response
Question
dig webstyle.ch. NS
Answer
webstyle.ch. 5 NS dns1.webstyle.ch.
webstyle.ch. 5 NS dns2.webstyle.ch.
Authority
The response has no authority records.
Additional
dns1.webstyle.ch. 5 A 192.162.28.50
dns2.webstyle.ch. 5 A 80.74.157.150
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0