B4J Code Snippet Dark theme - base color

1. Create a file named dark.css with this text in the Files folder:

.root {
  -fx-base: rgba(60, 63, 65, 255); // dark
}

2. Load it with:

MainForm.Stylesheets.Add(File.GetUri(File.DirAssets, "dark.css"))

That's it.

Based on this blog: http://dlsc.com/2017/07/03/javafx-tip-26/