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Bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
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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.
But there are libraries out there that do a lot of the heavy CSS lifting for you. Bootstrap is one example. It's a collection of CSS classes that are already pre written. So if you want a navigation bar that is black, it's as simple as specifying the classes "navbar navbar-dark bg-dark". Even if you use bootstrap, you still need to know some CSS because Bootstrap doesn't do all of the work for you and if you want something that Bootstrap doesn't offer, you have to style it yourself.