add: ui-switch style

add: virtual mode in Dropdown

lib/ui/css/variables/definition.scss

@@ -21,6 +21,8 @@
     --disabled-color: #aaa;
     --disabled-bg-color: #e9e9e9;
     --disabled-border-color: #d9d9d9;
+    --switch-bg-color: #eae9eb;
+    --switch-active-bg-color: #33c559;
 
     --red-color: red;
     --title-color: #fff;