98.css – A design system for building faithful recreations of old UIs

Also worth checking out: https://botoxparty.github.io/XP.css and https://khang-nd.github.io/7.css

In both of these as well as submission link, one of the things that is clearly and strikingly different from modern UI is the lack of very abundant amount of padding space. I think it's almost the mantra that we need breathing room, e.g., between different options in a radio-group box list of items... but I find lesser space (as was characteristic of older UI's) to be more honest... more respectful to me as an end-user, more information-dense.

I don't want to discard whatever innovation has been done, but man I find myself being nostalgic of old UI quite often.

With old 640 x 480 or 800 x 600 resolutions, the screen real estate came at premium. There wasn't much room to use generous padding and still make all the buttons and UI fields fit in the low resolution displays.