Adds style and crappy exit button

src/assets/nav.css

@@ -0,0 +1,3 @@
+#exit{
+    -fx-background-color: rgba(255, 0, 255, 0.5);
+}

src/sample/Main.java

@@ -16,6 +16,8 @@ public class Main extends Application {
         primaryStage.setTitle("Hello World");
         primaryStage.setScene(new Scene(root, 400, 400));
         primaryStage.show();
+
+        root.lookup("#exit").setOnMouseClicked(event -> primaryStage.close());                                          // Close program if button is clicked
     }
 
 

src/sample/sample.fxml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import javafx.scene.control.Button?>
 <?import javafx.scene.layout.Pane?>
 
-
-<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.102" xmlns:fx="http://javafx.com/fxml/1" />
+<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.102" xmlns:fx="http://javafx.com/fxml/1">
+   <children>
+      <Button id="exit" fx:id="pepe" alignment="TOP_RIGHT" contentDisplay="RIGHT" mnemonicParsing="false" stylesheets="@../assets/nav.css" text="Click if you like Pepe" />
+   </children>
+</Pane>