I can’t figure out how to get the borderPane space filled without any space left in the stage. The borderPane cannot be changed to a gridPane because that is not the directions I need to follow. I am looking for a way to resize the borderPane components or make the buttons fill the space completly. As a bonus a way for the buttons and borderPane to change size with the window. The buttons should all be the same size. THANKS

This is what I want: end result should be this

This is what I have: [The Gui I di d](https://i.sstatic.net/f5ghQcq6.png)

import javafx.scene.layout.BorderPane;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.scene.control.*;
import javafx.geometry.*;

public class MagicSquares extends Application {
         Button tRButton;
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        Button tLButton = new Button("1");
        Button tCButton = new Button("2");
        Button tRButton = new Button("3");
        HBox topRow = new HBox(tLButton, tCButton, tRButton);
        topRow.getStyleClass().add("a");

        Button mLButton = new Button("4");
        VBox middleLeft = new VBox(mLButton);
        middleLeft.getStyleClass().add("b");

        Button mCButton = new Button("5");
        HBox middleCenter = new HBox(mCButton);

        Button mRButton = new Button("6");
        VBox middleRight = new VBox(mRButton);
        middleRight.getStyleClass().add("c");

        Button bLButton = new Button("7");
        Button bCButton = new Button("8");
        Button bRButton = new Button("9");
        HBox bottomRow = new HBox (bLButton, bCButton, bRButton);
        bottomRow.getStyleClass().add("d");


        BorderPane bPane = new BorderPane();
        bPane.setTop(topRow);
        bPane.setLeft(middleLeft);
        bPane.setCenter(middleCenter);
        bPane.setRight(middleRight);
        bPane.setBottom(bottomRow);

        Scene scene = new Scene(bPane);

        primaryStage.setScene(scene);
        primaryStage.show();
        scene.getStylesheets().add("styles.css");
    }
}

I tried to change the boxes around and use only three vboxs. I added color to see the layout more clearly but still no luck. I have tried alot of resizing as well like Prefwidth, max/min–width with double.MAX.. of the buttons, boxes and borderPane.