diff --git a/src/main/generated-sources/sarl/io/sarl/demos/fireworks/.Firework.java._trace b/src/main/generated-sources/sarl/io/sarl/demos/fireworks/.Firework.java._trace
index 10b82e0..8a46ebd 100644
Binary files a/src/main/generated-sources/sarl/io/sarl/demos/fireworks/.Firework.java._trace and b/src/main/generated-sources/sarl/io/sarl/demos/fireworks/.Firework.java._trace differ
diff --git a/src/main/generated-sources/sarl/io/sarl/demos/fireworks/Firework.java b/src/main/generated-sources/sarl/io/sarl/demos/fireworks/Firework.java
index 7889052..271cbf7 100644
--- a/src/main/generated-sources/sarl/io/sarl/demos/fireworks/Firework.java
+++ b/src/main/generated-sources/sarl/io/sarl/demos/fireworks/Firework.java
@@ -4,11 +4,13 @@ import io.janusproject.Boot;
 import io.janusproject.kernel.Kernel;
 import io.sarl.demos.fireworks.agents.LaunchingArea;
 import io.sarl.demos.fireworks.gui.FXMLViewerController;
+import io.sarl.lang.annotation.SarlElementType;
 import io.sarl.lang.annotation.SarlSpecification;
 import io.sarl.lang.annotation.SyntheticMember;
 import org.eclipse.xtext.xbase.lib.Exceptions;
 
-@SarlSpecification("0.6")
+@SarlSpecification("0.5")
+@SarlElementType(8)
 @SuppressWarnings("all")
 public class Firework {
   public static Kernel main(final FXMLViewerController controller) {
@@ -16,6 +18,7 @@ public class Firework {
       Kernel _xblockexpression = null;
       {
         Boot.setOffline(true);
+        Boot.setVerboseLevel(7);
         _xblockexpression = Boot.startJanus(LaunchingArea.class, controller);
       }
       return _xblockexpression;
diff --git a/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.fxml b/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.fxml
index 03da7a7..bdfbc35 100644
--- a/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.fxml
+++ b/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.fxml
@@ -1,14 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import javafx.geometry.*?>
-<?import javafx.scene.effect.*?>
-<?import javafx.scene.*?>
-<?import javafx.scene.control.*?>
-<?import javafx.scene.canvas.*?>
-<?import java.lang.*?>
-<?import javafx.scene.layout.*?>
+<?import javafx.scene.canvas.Canvas?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.ScrollBar?>
+<?import javafx.scene.layout.AnchorPane?>
+<?import javafx.scene.layout.Pane?>
 
-<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="608.0" prefWidth="933.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="io.sarl.demos.fireworks.gui.FXMLViewerController">
+<Pane fx:id="main_pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="608.0" prefWidth="933.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="io.sarl.demos.fireworks.gui.FXMLViewerController">
    <children>
       <Canvas fx:id="draw_zone" height="583.0" layoutX="199.0" layoutY="13.0" rotate="180.0" width="715.0" />
       <Button fx:id="setup_button" layoutX="26.0" layoutY="45.0" mnemonicParsing="false" onAction="#actionSetup" text="Setup" />
diff --git a/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.sarl b/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.sarl
index abc935e..71c00c5 100644
--- a/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.sarl
+++ b/src/main/sarl/io/sarl/demos/fireworks/FireworksFXApplication.sarl
@@ -21,6 +21,7 @@ class FireworksFXApplication extends Application {
 		loader.setBuilderFactory(new JavaFXBuilderFactory());
 		var root : Parent = loader.load(location.openStream()) as Parent;
 		var scene : Scene = new Scene(root);
+		scene.getStylesheets().add(getClass().getResource("ViewerController.css").toExternalForm);
 		stage.setTitle("SARL Demo: Fireworks Animation");
 		stage.setScene(scene);
 		stage.show();
diff --git a/src/main/sarl/io/sarl/demos/fireworks/ViewerController.css b/src/main/sarl/io/sarl/demos/fireworks/ViewerController.css
new file mode 100644
index 0000000..908fb05
--- /dev/null
+++ b/src/main/sarl/io/sarl/demos/fireworks/ViewerController.css
@@ -0,0 +1,46 @@
+/*
+* @Author: Bartuccio Antoine
+* @Date:   2017-05-26 16:41:58
+* @Last Modified by:   klmp200
+* @Last Modified time: 2017-05-26 17:29:05
+*/
+
+// Nice white #F9FAFB
+// Nice black #2B2B2B
+
+#main_pane {
+	-fx-background-color: #2B2B2B;
+}
+
+.scroll-bar {
+	-fx-background-color: rgb(57, 57, 57);
+}
+
+.scroll-bar .thumb {
+	-fx-background-color: rgb(169, 169, 169);
+	-fx-background-radius: 0em;
+	-fx-background-inserts: 0, 0, 0;
+}
+
+.scroll-bar .increment-arrow,
+.scroll-bar .decrement-arrow {
+	-fx-color: rgb(169, 169, 169);
+}
+
+.scroll-bar:hover .increment-arrow,
+.scroll-bar:hover .decrement-arrow {
+	-fx-color: #2B2B2B;
+	-fx-background-color: rgb(169, 169, 169);
+}
+
+.label {
+	-fx-text-fill: #F9FAFB;
+}
+
+.button {
+	-fx-background-radius: 0em;
+	-fx-background-inserts: 0, 0, 0;
+	-fx-focus-color: transparent;
+	-fx-text-fill: #2B2B2B;
+	-fx-background-color: rgb(169, 169, 169);
+}
\ No newline at end of file