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In tornadoFX I found one issue without any solution, if I want to design a window without FXML, I can't *add a margin* is there anyone managed to do that with the CSS file or tornadoFX style builders?

You can use something like `vboxConstraints { }`
ref : <https://edvin.gitbooks.io/tornadofx-guide/content/part1/7_Layouts_and_Menus.html>

DSL
```root {
  padding = 1.em
}
```
CSS
```.root {
  -fx-padding: 1em;
}```

<@U10EJRH2L> This way you will end up adding inside-padding on a component like buttons

Yes, the padding will be added to whatever the root of the scene is. JavaFX doesn't have a distinction between padding and margins. "Margins" are just some form of padding on a parent.

If you have a button as the root, just wrap it in a `Pane` of some sort and pad the pane.

Some components may add their own concept of a margin, but it's not a universal thing like in HTML.