A modern programming language that makes developers happier.

kotlinlang

What are you asking specifically? If you're asking what technology is best, definitely CSS using TFX's type safe DSL (I may be a bit biased...).

If you're asking what it should look like, there is no "best".

Have you read through the guide: <https://edvin.gitbooks.io/tornadofx-guide/content/|https://edvin.gitbooks.io/tornadofx-guide/content/>? It has a section on CSS.

True, if you need to know what specifically can be styled for a given `Node`, I'd recommend checking out the official JavaFX CSS Reference: <https://docs.oracle.com/javase/8/javafx/api/javafx/scene/doc-files/cssref.html|https://docs.oracle.com/javase/8/javafx/api/javafx/scene/doc-files/cssref.html>

There is a bootstrap.css for JavaFX that I use

quick and easy way to get a decent looking app with almost 0 effort

you just add the css to your resources and load that