JavaFX / ScalaFX - Change text color of disabled TextArea?

I have a GUI with some TextArea controls to display information. Since the GUI will respond to key events, I added an EventHandler to the scene element. Since I didn't want to add one EventHandler to each text area, I disabled them to prevent them from focusing, because then the scene's event handler no longer works. Now I have the problem that the text is grayed out and not black, but I changed it in the css file. Do you have any ideas why the text is not black and how can I fix it?

Here's some code:

private val scene =
  new Scene {
    stylesheets.add("css/style.css")
    onKeyTyped = (new EventHandler[KeyEvent] {
      def handle(event: KeyEvent) {
        ...
      }
    })
  ...
}

private val description = new TextArea{    
  text = "some text"
  wrapText = true
  disable = true 
  styleClass.add("txtarea")      
  maxHeight = 400
}


.txtarea:disabled{  
  -fx-font-size: 18pt;
  -fx-text-fill: #000000;
  -fx-prompt-text-fill: #000000;
  -fx-opacity: 1.0;
  -fx-background-color: white;  
}