A very simple web challenge.
The site says it's under construction and there is not much there, but if we check robots.txt we can see:
User-agent: *
Disallow: /flag/
And in flag directory there is flag.txt but it says we're not allowed to see it.
However if we look at the network communication, there is a cookie isAllowed sent by the webpage, set to false.
If we set it to true we can see the flag: hackover18{W3llD0n3,K1d.Th4tSh0tw4s1InAM1ll10n}