Java SE (Java Platform, Standard Edition)

HI again! Thanks for all the help!
I need help again , please

How can i paint inside the grid, like , make all black;

Heres my Two Classes, the css file and the java class. Please help

package musica;

import java.io.File;
import javafx.application.Application;
import javafx.beans.property.ObjectProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.scene.media.Media;
import javafx.scene.media.MediaErrorEvent;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.util.Duration;
import javax.swing.Action;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import javax.swing.JTextField;
import javafx.scene.paint.*;

/**
 * 
 * @author André Lopes
 */

public class Musica extends Application {
    public MediaPlayer MP;
    public Media Media;
    public static String MusicURL;
    public static JFileChooser JFC;
    public static Duration currentTime;
    public MediaView mediaView;
    public static WebView view;
    public static WebEngine webEng;
    public static TextField webFieldURL; 
    private static String webUrl;
    
    
    private void init(Stage primaryStage) {
       view = new WebView();
        view.setMaxSize(1000,1000);
         view.setMinSize(950,700);
      
       webEng = view.getEngine();
       webEng.load("http://www.google.com.br");
       System.out.println("Web Engine Started!");
       
    }
    
    
    public Musica()
    {
    webUrl = "www.google.com.br";
    webFieldURL = new TextField(webUrl);
    currentTime = Duration.ZERO;
    mediaView= new MediaView(MP);
    MusicURL = "";
    
   
    
    
     //URL = "http://download.oracle.com/otndocs/products/javafx/oow2010-2.flv";
    }
            
    
    
    //////////////////////////////////////////////////////////////
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello! This is Yours Music Player!");
        
        //Carrega A Web-Objects!
        init(primaryStage);
        
        //Botão Play
        Button Play = new Button();
        Play.setText("Play");
        Play.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event1) {
                Media = new Media(MusicURL);
                MP = new MediaPlayer(Media);
                MP.setStartTime(currentTime);
                mediaView.setMediaPlayer(MP);
                MP.play();
                System.out.println("MediaPlayerStatus: "+ MP.getStatus());
                mediaView.setOnError(new EventHandler<MediaErrorEvent>() {
                  @Override
                    public void handle(MediaErrorEvent arg0) {
                        System.out.println("MediaErrorEvent-arg0: " + MP.getStatus());
                           
                        }
                    });
                }
       });
                
        
       //Botão para Entrar No site Digitado
        Button SendWebUrl = new Button();
        SendWebUrl.setVisible(true);
        SendWebUrl.setText("Send");
        SendWebUrl.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent arg0) {
                webUrl = webFieldURL.getText();
                EnterWebSite(webUrl);
            }
        });
        
        
        
       //Botão pra escolher Musica
        Button SelctFileButton = new Button();
        SelctFileButton.setText("Music Chooser/Finder:");
        SelctFileButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
              public void handle(ActionEvent arg0) {
                System.out.println("Java File Chooser Opened");
                JFileChooser search = new JFileChooser();
                search.showDialog(search,null);
                MusicURL = search.getSelectedFile().toURI().toString();
                System.out.println("File URL: "+MusicURL);
            }
        });

            
       //Botão para pausar;
       Button Pause = new Button();
       
       Pause.setText("Pause");
       Pause.setFont(Font.font(null, FontPosture.ITALIC,15));
       Pause.setOnAction(new EventHandler<ActionEvent>() {
       @Override
            public void handle(ActionEvent arg0) {
            try {
                currentTime = MP.getCurrentTime();
                MP.pause();   
                
                }catch(java.lang.NullPointerException e)
                {
                 System.out.println("java.lang.NullPointerException \n");   
                 System.out.println("Error: Unable To pause! May happens if you didnt have a music Playing!");   
                }
                
                }
        });
        
       
       //Botão Para Continuar;
       Button Continue = new Button();
       Continue.setText("Continue/UnPause");
       Continue.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent arg0) {
               //MP.setStartTime(currentTime);
               MP.pause();
            }
        });
        
     
        //Grid ! Layout
        GridPane grid = new GridPane();
        
        StackPane root = new StackPane();
        
        grid.setHgap(2);
        grid.setHgap(2);
        grid.setVgap(2);
        
        Scene Scene = new Scene(root,500,500);
        
        Scene.getStylesheets().add(getClass().getResource("Cascade.css").toExternalForm());
        grid.getStyleClass().add(getClass().getResource("Cascade.css").toExternalForm());
        root.getStyleClass().add(getClass().getResource("Cascade.css").toExternalForm());
       
        root.getChildren().add(grid);
       
     primaryStage.setScene(Scene);
        primaryStage.show();
        
        //Adicionando Botoes no Grid (Grid.add(NODE,Column,Row);
        grid.add(Play,1,3);
        grid.add(Pause,2,3);
        grid.add(SelctFileButton,1,4);
        grid.add(view,10,10);
        webFieldURL.appendText(" ");
        grid.add(webFieldURL,10,8);
        grid.add(SendWebUrl,9,8);
        
    }
    
    //Método para trocar de Site
    public static void EnterWebSite(String WebUrl)
    {
        System.out.println("Entering A Website!");
        webEng = view.getEngine();
        webEng.load("http://" + WebUrl);
    }
    
    
    //Main
    public static void main(String[] args) {
    launch(args);
    }
    
}

CSS:

/* 
    Document   : Cascade
    Created on : 07/05/2012, 22:01:28
    Author     : André
    Description:
        Purpose of the stylesheet follows.
*/

.root{
    -fx-font-size: 14pt;
    -fx-font-family: "Tahoma";
    -fx-base: #DFB951;
    -fx-background: #A78732;
    -fx-focus-color: #B6A678;
}

GridPanel{

columns:500;
rows:500;


-fx-color:red;
-fx-background-color: red;
}

.grid {
    -fx-color: black;
    -fx-background-color: black;
    
       
}