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Semantic UI
Semantic is a UI component framework based around useful principles from natural language.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
CSS and HTML is great for documents - not so great for applications. Most sites end up implementing their own navigation UI/UX at a minimum (an application) - many end up as more applications.
For an example of "documents", see eg:
https://edwardtufte.github.io/tufte-css/
Or
https://alistapart.com/article/building-books-with-css3/
I'm a big fan of Semantic UI, but I thought it was dead? There's barely been any activity on the repo in over 5 years (https://github.com/Semantic-Org/Semantic-UI/graphs/contribut...).
* use cva https://github.com/joe-bell/cva to style generic ui components (like buttons) to archive same grouping as in semantic css