JavaFX CSS background color

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
import javafx.scene.layout.StackPane;

public class Main extends Application {
  @Override// w  w w.j av  a  2 s  . c  om
  public void start(Stage primaryStage) {
    // Create a scene and place a button in the scene
    StackPane pane = new StackPane();
    Button btOK = new Button("OK");
    btOK.setStyle("-fx-border-color: blue;");
    pane.getChildren().add(btOK);    
    
    pane.setRotate(45);
    pane.setStyle("-fx-border-color: red; -fx-background-color: lightgray;");
    
    Scene scene = new Scene(pane, 200, 250);
    primaryStage.setTitle("java2s.com");
    primaryStage.setScene(scene);
    primaryStage.show();
  }
  

  public static void main(String[] args) {
    launch(args);
  }
}