diff --git a/TC1/http_server/web/index.html b/TC1/http_server/web/index.html
index 4ad06eb..8e76404 100644
--- a/TC1/http_server/web/index.html
+++ b/TC1/http_server/web/index.html
@@ -21,7 +21,7 @@
     <link rel="shortcut icon" href="http://yuntong.icu/tc1/images/favicon.png">
     <link rel="stylesheet" href="assets/css_pack.css">
     <style>
-        .mdl-menu__container {
+        .mdl-menu {
             max-height: 300px !important;
             overflow-y: auto !important;
         }