import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.Region;
import javafx.scene.paint.Color;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class WebViewApp extends Application {

    private Scene scene;

    @Override
    public void start(Stage stage) {
        // create the scene
        stage.setTitle("Web View");
        scene = new Scene(new FxBrowser(), 750, 500, Color.web("#666970"));
        stage.setScene(scene);
        scene.getStylesheets().add("BrowserToolbar.css");
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
class FxBrowser extends Region {

    final WebView browser = new WebView();
    final WebEngine webEngine = browser.getEngine();

    public FxBrowser() {
        //apply the styles
        getStyleClass().add("browser");
        // load the web page
        webEngine.load("https://www.wikipedia.org/");
        //add the web view to the scene
        getChildren().add(browser);
    }

    private Node createSpacer() {
        Region spacer = new Region();
        HBox.setHgrow(spacer, Priority.ALWAYS);
        return spacer;
    }

    @Override
    protected void layoutChildren() {
        double w = getWidth();
        double h = getHeight();
        layoutInArea(browser, 0, 0, w, h, 0, HPos.CENTER, VPos.CENTER);
    }

    @Override
    protected double computePrefWidth(double height) {
        return 750;
    }

    @Override
    protected double computePrefHeight(double width) {
        return 500;
    }
}