Toolbar : Gap lost between the buttons on toolbar

 @Override
    public void start(Stage stage) throws Exception {
        BorderPane root = new BorderPane();
        ToolBar toolbar = new ToolBar();
        toolbar.getItems().addAll(new Button("Ok"), new Button("Cansel"));
        Scene scene = new Scene(root);
        root.setTop(toolbar);
        stage.setScene(scene);
        stage.show();
        stage.setTitle(VersionInfo.getRuntimeVersion());
    }