diff --git a/templates/index.html b/templates/index.html
index 9382326..00e5d10 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -1,11 +1,13 @@
 <!DOCTYPE html>
-<html>
+<html lang="zh-CN">
 <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>KaTeX示例</title>
     <link rel="icon" href="/static/favicon.ico" type="image/x-icon">
-    <link rel="stylesheet" href="/static/katex/katex.min.css" crossorigin="anonymous">
-    <script defer src="/static/katex/katex.min.js" crossorigin="anonymous"></script>
-    <script defer src="/static/katex/contrib/auto-render.min.js" crossorigin="anonymous"></script>
+    <link rel="stylesheet" href="/static/katex/katex.min.css">
+    <script defer src="/static/katex/katex.min.js"></script>
+    <script defer src="/static/katex/contrib/auto-render.min.js"></script>
     <script src="/static/js/html2pdf.bundle.min.js"></script>
     <link rel="stylesheet" href="/static/css/style.css">
 </head>
@@ -13,13 +15,6 @@
 <body>
 
     <div class="content-container">
-        <!--
-        <h1>这个地方放需要的公式</h1> 
-        <p>这是一个行内公式：$x^2 + y^2 = z^2$</p>
-        <p>这是一个独立公式：</p>
-        $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$
-        -->
-
         <div class="formula">
             <h3 onclick="toggleFormula(this)">转化风速：▶</h3>
             <div class="content" style="display: none;">
@@ -94,10 +89,10 @@
     <div class="notification" id="notification"></div>
 
     <script src="/static/js/afterbody.js"></script>
+
+    <footer>
+        <p class="version">版本号: </p>
+    </footer>
 </body>
 
-<footer>
-    <p class="version">版本号: </p>
-</footer>
-
 </html>
