使用css在javafx中调整stackpane

Question

i'm working with javaFx and i want resize my stackPane or add border, how can i do that? and how can i position it in the center or my window?

this is my code:

 final HBox box =  new HBox();
        box.getStyleClass().add("box");
        final ToolBar outils = new ToolBar();
        final Button file = new Button("fichier");
        final Button as2 = new Button("AS2");
        final Button ftp = new Button("FTP");
        final Button arrow = new Button("Liaison");
        file.setGraphic(new ImageView("/images/file.png"));
        as2.setGraphic(new ImageView("/images/http.png"));
        ftp.setGraphic(new ImageView("/images/ftp.png"));
        arrow.setGraphic(new ImageView("/images/Arrow.png"));
        box.getChildren().addAll(file,as2,ftp,arrow);
        outils.getItems().addAll(box);



        // ma zone de dessin
        final StackPane paint = new StackPane();
          paint.setStyle("-fx-background-color: #FFFFFF;");
        paint.setPrefSize(0, 690);
        paint.getStyleClass().add("paint");

and this is my window :

tks

Answer 1

try this ; in your controller

@FXML StackPane pane;

public void Action(){
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.
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    pane.setPrefHeight(value);
    pane.setPrefWidth(value);
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