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styled-components
Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress 💅
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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.
When they say it is stylized - what does that mean? Is it this? https://styled-components.com/ I haven't worked with this myself before but it looks like it just houses css. However, I haven't used this myself as I prefer to separate my scss/css files from my components. It is not uncommon when using a library like this that it may have an odd limitation or bug that you would not imagine before running into it.