diff --git a/app/index.html b/app/index.html
index 2f3bf44..7954ec7 100644
--- a/app/index.html
+++ b/app/index.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <link rel="icon" href="/favicon.ico" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=3.0, user-scalable=yes" />
     <title>Chat Nio</title>
     <meta name="keywords" content="ChatGPT, AI聊天, ChatNio, chatnio">
     <meta name="description" content="👋 Chat Nio, lightweight Web ChatGPT chat site 👋 Chat Nio, 一个轻量级的联网版 AI 聊天网站">
