fix delete node bug

src/module/editor.receiver.js

@@ -216,6 +216,8 @@ Minder.Receiver = kity.createClass('Receiver', {
                     case keymap.right:
                     case keymap.up:
                     case keymap.down:
+                    case keymap.Backspace:
+                    case keymap.Del:
                         if(this.selection.isHide()){
                             restoreTextContent();
                             this.km.setStatus('normal');

src/theme/fresh.js

@@ -50,7 +50,7 @@
             'drop-hint-color': hsl(h, 26, 35),
             'drop-hint-width': 5,
 
-            'order-hint-area-color': hsl(h, 100, 95).set('a', 0.5),
+            'order-hint-area-color': hsl(h, 100, 30).set('a', 0.5),
             'order-hint-path-color': hsl(h, 100, 25),
             'order-hint-path-width': 1,