add navigation bar with back button

css/pexeso.css

@@ -1,6 +1,7 @@
 body {
 	margin: 0;
 	background: lightyellow;
+	font-family: 		Arial, Verdana, sans-serif;
 }
 
 #mainContent {
@@ -8,7 +9,7 @@ body {
 	font-size: xx-large;
 	font-weight: bold;
 	border-radius: 4px;
-	text-align: center;
+	
 }
 .buttonStyle {
 	border-radius: 4px;
@@ -42,23 +43,18 @@ body {
 	cursor: pointer;
 }
 
-.solved {
-	background: green;
+.navigationButton {
+	cursor: pointer;
+	text-align:left;
 }
 
-.selected1 {
-	background: yellow;
+#navigationBar {
+	background: #75755f;
+	font-size: xx-large;
+	padding: 2px 10px 2px 10px;
+	color: white;
 }
 
-.selected2 {
-	background: orange;
-}
-
-.selected3 {
-	background: white;
-}
-
-.mystery {
-	background: blue;
-	
+#levelTitle {
+	float:right;
 }