This looks so much like https://dns.he.net/ that it seems to me it can’t be a coincidence. Is this a case of copying a well known design or is there more to it?
And yes, there absolutely was a "look" that's a product of the technology of the time - tables for design, limited styling / js support, php "components" that you could load and replace as part of your portal, and "themes".
we lost so much with SPAs and js everywhere.
htmx will save us!
There's a name I haven't heard in a while!