Every modern web application needs a proper front end stack. Ruby on Rails uses Webpack as the default (starting with Rails 6). It allows you to add and set up modern packages in your app quickly and easy. Sjabloon comes by default with PostCss, Tailwind Css and Stimulus JS fully set up and ready to go.
Tailwind is an amazing set of Css utilites with an easy to remember naming convention and a great build tool and plug-ins system. It's build on top of PostCss, so you can create stunning UI real fast that is easy to change and build.
While I highly recommend this stack to be the most efficient for building amazing looking UI that are versatile and quick to build, it's easy to switch to Vue, React or “JSAmazing2020”.