diff --git a/Classes/css/core/Context.java b/Classes/css/core/Context.java
index 3c7ee4e..3a8768e 100644
--- a/Classes/css/core/Context.java
+++ b/Classes/css/core/Context.java
@@ -2,19 +2,72 @@ package Classes.css.core;
 
 import java.util.HashMap;
 
+import javafx.scene.paint.Color;
+
 public class Context{
+
+	public final static int TYPE_INT = 1;
+	public final static int TYPE_STR = 2;
+	public final static int TYPE_COL = 3;
 	
 	/* Context data (associative array) */
-	private static HashMap<String, Object> attr = new HashMap<String, Object>();
+	private static HashMap<String, Object>  attr = new HashMap<String, Object>();
+	private static HashMap<String, Integer> type = new HashMap<String, Integer>();
 	
 	/* Add data */
-	public static void bind(String index, Object data){
+	public static void bind(String index, Integer data){ /* INT */
 		Context.attr.put(index,  data);
+		Context.type.put(index, Context.TYPE_INT);
 	}
 	
-	/* Fetch data */
-	public static Object get(String index){
-		return Context.attr.get(index);
+	public static void bind(String index, String data){ /* String */
+		Context.attr.put(index,  data);
+		Context.type.put(index, Context.TYPE_STR);
 	}
 	
+	public static void bind(String index, int r, int g, int b){ /* Color */
+		Context.attr.put(index,  Color.rgb(r, g, b));
+		Context.type.put(index, Context.TYPE_COL);
+	}
+	
+	/* Fetch data -> String */
+	public static String getString(String index){
+		
+		/* (1) If color: return HEX */
+		if( Context.type.get(index) == Context.TYPE_COL )
+			
+			return String.format("#%02X%02X%02X", 
+						(int)( ((Color) Context.attr.get(index)).getRed()   * 255 ),
+						(int)( ((Color) Context.attr.get(index)).getGreen() * 255 ),
+						(int)( ((Color) Context.attr.get(index)).getBlue()  * 255 )
+					);
+		
+		/* (2) By default -> String auto cast*/
+		return Context.attr.get(index).toString();
+	}
+
+	/* Fetch data -> Int */
+	public static Integer getInt(String index) throws Exception{
+		
+		/* (1) If not INT -> abort */
+		if( Context.type.get(index) != Context.TYPE_INT )
+			throw new Exception("Not an int value");
+			
+		
+		/* (2) By default -> int */
+		return (Integer) Context.attr.get(index);
+	}
+	
+	/* Fetch data -> Color */
+	public static Color getColor(String index) throws Exception{
+
+		/* (1) If not COLOR -> abort */
+		if( Context.type.get(index) != Context.TYPE_COL )
+			throw new Exception("Not a color value");
+		
+		/* (2) By default -> COLOR */
+		return (Color) Context.attr.get(index);
+		
+	}
+		
 }
diff --git a/Classes/css/user/ContextBuilder.java b/Classes/css/user/ContextBuilder.java
index 992a275..b248a7a 100644
--- a/Classes/css/user/ContextBuilder.java
+++ b/Classes/css/user/ContextBuilder.java
@@ -14,6 +14,10 @@ public class ContextBuilder{
 		Context.bind("header-height", 50);
 		Context.bind("menu-width",    237);
 		
+		/* (3) Colors */
+		Context.bind("main-color", 63, 81, 181);
+		Context.bind("menu-bg", 255, 255, 253);
+		
 	}
 
 }
diff --git a/Classes/css/user/Header.java b/Classes/css/user/Header.java
index 4e21bdb..b582f25 100644
--- a/Classes/css/user/Header.java
+++ b/Classes/css/user/Header.java
@@ -15,18 +15,15 @@ public class Header{
 //			.add("left", 0)
 //			.add("right", 0)
 			
-			.add("min-height", Context.get("header-height"))
-			.add("pref-height", Context.get("header-height"))
-			.add("max-height", Context.get("header-height"))
+			.add("min-height", Context.getInt("header-height"))
+			.add("pref-height", Context.getInt("header-height"))
+			.add("max-height", Context.getInt("header-height"))
 			
-			.add("min-width", Context.get("screen-width"))
-			.add("pref-width", Context.get("screen-width"))
-			.add("max-width", Context.get("screen-width"))
+			.add("min-width", Context.getInt("screen-width"))
+			.add("pref-width", Context.getInt("screen-width"))
+			.add("max-width", Context.getInt("screen-width"))
 			
-			.add("background-color", "#3f51b5")
-			
-//			.add("border-width", "0 0 1 0")
-//			.add("border-color", "#3240a3")
+			.add("background-color", Context.getString("main-color"))
 			
 			.apply();
 	}
diff --git a/Classes/css/user/MenuContainer.java b/Classes/css/user/MenuContainer.java
index 894b268..7b3b010 100644
--- a/Classes/css/user/MenuContainer.java
+++ b/Classes/css/user/MenuContainer.java
@@ -9,23 +9,18 @@ public class MenuContainer{
 	/* Builds all necessary CSS/layout rules */
 	public MenuContainer(Node target) throws Exception{
 		
-		
-		/* (1) Calculate menu height (screen.height - header.height) */
-		Integer menu_height = Integer.valueOf( Context.get("screen-height").toString() );
-			   menu_height -= Integer.valueOf( Context.get("header-height").toString() );
-		
-		/* (2) Set rules */
+		/* (1) Set rules */
 		Ruleset.load(target)
-			.add("top", Context.get("header-height"))
+			.add("top", Context.getInt("header-height"))
 			.add("left", 0)
 			
-			.add("min-width", Context.get("menu-width"))
-			.add("max-width", Context.get("menu-width"))
+			.add("min-width", Context.getInt("menu-width"))
+			.add("max-width", Context.getInt("menu-width"))
 		
-			.add("min-height", menu_height)
-			.add("max-height", menu_height)
+			.add("min-height", Context.getInt("screen-height") - Context.getInt("header-height"))
+			.add("max-height", Context.getInt("screen-height") - Context.getInt("header-height"))
 			
-			.add("background-color", "#fffffd")
+			.add("background-color", Context.getString("menu-bg"))
 			.apply();
 	}
 
diff --git a/css/header.css b/css/header.css
index b9aa92f..b4565fd 100644
--- a/css/header.css
+++ b/css/header.css
@@ -1,9 +1,8 @@
 @import "./constants.css";
-/* 
+ 
 #header{
-	-fx-border-width: 0 0 1 0;
-	-fx-border-color: #3240a3;
-} */
+	-fx-background-color: #3f51b5;
+}
 
 #header_menu{
 	
diff --git a/css/menu.css b/css/menu.css
index e8cd14b..cf280f8 100644
--- a/css/menu.css
+++ b/css/menu.css
@@ -17,7 +17,7 @@
 	
 }
 
-/*
+
 #menu_container{
 	
 	-fx-min-width: 237;
@@ -28,4 +28,4 @@
 	
 	-fx-background-color: #fffffd;
 
-}*/
\ No newline at end of file
+}
\ No newline at end of file