one little comment

src/Board.js

@@ -17,7 +17,7 @@ import DemoString from './String'
 // import {flexlayout_json as json} from './demo-1-config'
 import {flexlayout_json as json} from './devel-config'
 
-// CSS
+// CSS common to the whole app
 import './Common.css'
 
 class ObservableStore {