diff --git a/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.fxml b/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.fxml
index bf86b89..360dc7c 100644
--- a/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.fxml
+++ b/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.fxml
@@ -4,7 +4,7 @@
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.layout.Pane?>
 
-<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="608.0" prefWidth="813.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="io.sarl.demos.sierpinski.gui.FXMLViewerController">
+<Pane fx:id="mainPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="608.0" prefWidth="813.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="io.sarl.demos.sierpinski.gui.FXMLViewerController">
    <children>
       <Canvas fx:id="drawZone" height="600.0" layoutX="199.0" layoutY="4.0" rotate="180.0" scaleX="-1.0" width="600.0" />
       <Button layoutX="26.0" layoutY="45.0" mnemonicParsing="false" onAction="#actionSetup" text="Setup" />
diff --git a/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.sarl b/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.sarl
index 8a70360..e5ad2fd 100644
--- a/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.sarl
+++ b/src/main/sarl/io/sarl/demos/sierpinski/FractalesFXApplication.sarl
@@ -20,6 +20,7 @@ class FractalesFXApplications extends Application {
 		loader.setBuilderFactory(new JavaFXBuilderFactory)
 		var root: Parent = loader.load(location.openStream) as Parent
 		var scene: Scene = new Scene(root)
+		scene.stylesheets.add(class.getResource("ViewerController.css").toExternalForm)
 		stage.setTitle("SARL Demo: Sierpinski Fractal Animation")
 		stage.setScene(scene)
 		stage.show
diff --git a/src/main/sarl/io/sarl/demos/sierpinski/ViewerController.css b/src/main/sarl/io/sarl/demos/sierpinski/ViewerController.css
new file mode 100644
index 0000000..1456ee2
--- /dev/null
+++ b/src/main/sarl/io/sarl/demos/sierpinski/ViewerController.css
@@ -0,0 +1,46 @@
+/*
+* @Author: Bartuccio Antoine
+* @Date:   2017-05-26 17:51:42
+* @Last Modified by:   klmp200
+* @Last Modified time: 2017-05-26 17:55:16
+*/
+
+// Nice white #F9FAFB
+// Nice black #2B2B2B
+
+#mainPane {
+	-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
diff --git a/src/main/sarl/io/sarl/demos/sierpinski/gui/FXMLViewerController.sarl b/src/main/sarl/io/sarl/demos/sierpinski/gui/FXMLViewerController.sarl
index 11cb909..bbc2aff 100644
--- a/src/main/sarl/io/sarl/demos/sierpinski/gui/FXMLViewerController.sarl
+++ b/src/main/sarl/io/sarl/demos/sierpinski/gui/FXMLViewerController.sarl
@@ -42,11 +42,12 @@ class FXMLViewerController implements EventListener {
 	@FXML private var multiplyButton: Button
 	
 	@FXML public def exitApplication(){
-		var e = new Exit()
-		this.multiplyButton.setDisable(true)
-		e.source = new Address(ispace.spaceID, id)
-		this.ispace.emit(e)
-//		Platform.ext()
+		if (setuped){
+			var e = new Exit()
+			this.multiplyButton.setDisable(true)
+			e.source = new Address(ispace.spaceID, id)
+			this.ispace.emit(e)
+		}
 	}
 	
 	@FXML protected def actionSetup() {