Using slightly brighter set of colors for message boxes.

docs/extra.less

@@ -72,8 +72,8 @@
 .message-box(@base-color) {
 	background:linear-gradient(to bottom,lighten(@base-color, 5%) 0%,@base-color 100%);
 	box-shadow:inset 0 0 32px darken(@base-color, 5%);
-	color:darken(@base-color, 75%);
-	border:2px solid desaturate(darken(@base-color, 10%), 40%);
+	color:darken(@base-color, 67%);
+	border:2px solid desaturate(darken(@base-color, 10%), 20%);
 }