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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.
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Bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
If you don’t know any JS frameworks, you could use a CSS framework e.g Tailwind CSS that achieves the same goal as component libraries, just in a different way.
These frameworks have component libraries built on top of them, which give a sleek looking design out of the box and fast development. My personal favourite is Chakra UI, but there’s also many more if you search for component libraries.