A hint as to why this page is named as such: https://cms.cern/news/two-most-massive-quarks-put-spotlight-higgs-boson

sudo su - www-data -s /bin/bash

Check this for details: https://jvns.ca/blog/2021/11/04/how-do-you-tell-if-a-problem-is-caused-by-dns

As a summary, try to get the website dns through:

$ dig iloveclim.eu

which, if functionnal will respond something like

iloveclim.eu.		3600	IN	A	78.196.23.159

Trying a non-existing sub-domain:

$ dig toto.iloveclim.eu
toto.iloveclim.eu.		IN	A

To check with a different name server, provide the nameserver ip as in (e.g. cloudfare):

$ dig @1.1.1.1 toto.iloveclim.eu

(this allows to check for DNS failures in current nameserver)