JavaFX CSS tester

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {
    public static void main(String[] args) {
        Application.launch(args);/*from   w w w .ja va  2s .  c o  m*/
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Borders");
        Group root = new Group();
        Scene scene = new Scene(root, 600, 330, Color.WHITE);
        
        // create a grid pane
        GridPane gridpane = new GridPane();
        gridpane.setPadding(new Insets(5));
        gridpane.setHgap(10);
        gridpane.setVgap(10);
        
        // label CSS Editor
        Label cssEditorLbl = new Label("CSS Editor");
        GridPane.setHalignment(cssEditorLbl, HPos.CENTER);
        gridpane.add(cssEditorLbl, 0, 0);

        // label Border View
        Label borderLbl = new Label("Border View");
        GridPane.setHalignment(borderLbl, HPos.CENTER);
        gridpane.add(borderLbl, 1, 0);

        // Text area for CSS editor
        final TextArea cssEditorFld = new TextArea();
        cssEditorFld.setPrefRowCount(10);
        cssEditorFld.setPrefColumnCount(100);
        cssEditorFld.setWrapText(true);
        cssEditorFld.setPrefWidth(150);
        GridPane.setHalignment(cssEditorFld, HPos.CENTER);
        gridpane.add(cssEditorFld, 0, 1);

        String cssDefault = "-fx-border-color: blue;\n"
                + "-fx-border-insets: 5;\n"
                + "-fx-border-width: 3;\n"
                + "-fx-border-style: dashed;\n";
        
        cssEditorFld.setText(cssDefault);

        final HBox pictureRegion = new HBox();
        pictureRegion.setStyle(cssDefault);
        pictureRegion.getChildren().add(new Label("demo2s.com"));
        gridpane.add(pictureRegion, 1, 1);

        
        Button apply = new Button("Change");
        GridPane.setHalignment(apply, HPos.RIGHT);
        gridpane.add(apply, 0, 2);
        
        apply.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent event) {
                pictureRegion.setStyle(cssEditorFld.getText());
            }
        });
        
        root.getChildren().add(gridpane);        
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}