As discussed on my blog here: http://jonathangiles.net/blog/?p=451

When trying to 'fix' the border width issue on a TextBox it was suggested to try the 'border-width: none;' CSS style. Unfortunately, this isn't supported, which Richard Bair noted was a bug. When a control is set to use this style, the following is output when the application runs:

Property 'borderStyle' is not supported on javafx.scene.control.TextBox (source rule: * {
  borderStyle: none;
})

Cheers,
Jonathan Giles