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


public class Main extends Application {
	@Override
    public void start(Stage primaryStage) {
		Application.setUserAgentStylesheet(getClass().getResource("application.css").toExternalForm());
        Alert alert = new Alert(AlertType.CONFIRMATION);
        alert.setTitle("Alert");
        alert.setContentText("Is it ok?");
        
        Button btn = new Button();
        btn.setText("Display dialog");
        btn.setOnAction(e->alert.show());
        
        StackPane root = new StackPane();
        root.getChildren().add(btn);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("Dialogs test");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
	
	public static void main(String[] args) {
		launch(args);
	}
}