omg, invoking php-nuke brings me back. fun era (recent php2shell wild ride notwithstanding). Honestly it's more like web 1.5 - not straight up hand written html but no wild client side stuff either.
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".