fix

demo/dev.html

@@ -7,7 +7,7 @@
     <script src="../configure.js"></script>
     <script src="../dist/dev.js"></script>
     <script src="../lang/zh-cn/zh-cn.js" charset="utf-8"></script>
-    <link href="../themes/default/_css/import.css" type="text/css" rel="stylesheet">
+    <link href="../themes/default/css/import.css" type="text/css" rel="stylesheet">
     <style>
         .km_receiver{
             width:0;