diff --git a/404.html b/404.html
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+<!DOCTYPE html>
+<!-- saved from url=(0035)https://codechina.csdn.net/404.html -->
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252" />
+    <meta content="width=device-width, initial-scale=1, maximum-scale=1" name="viewport" />
+    <link
+      rel="shortcut icon"
+      type="image/png"
+      href="https://codechina.csdn.net/uploads/-/system/appearance/favicon/1/logo_icon.png"
+      id="favicon"
+      data-original-href="/uploads/-/system/appearance/favicon/1/logo_icon.png"
+    />
+    <title>开源开发者加速空间</title>
+    <style>
+      body {
+        color: #666;
+        text-align: center;
+        font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+        margin: auto;
+        font-size: 14px;
+      }
+
+      h1 {
+        font-size: 56px;
+        line-height: 100px;
+        font-weight: 400;
+        color: #456;
+      }
+
+      h2 {
+        font-size: 24px;
+        color: #666;
+        line-height: 1.5em;
+      }
+
+      h3 {
+        color: #456;
+        font-size: 20px;
+        font-weight: 400;
+        line-height: 28px;
+      }
+
+      hr {
+        max-width: 800px;
+        margin: 18px auto;
+        border: 0;
+        border-top: 1px solid #eee;
+        border-bottom: 1px solid white;
+      }
+
+      img {
+        max-width: 200px;
+        display: block;
+        margin: 40px auto;
+      }
+
+      a {
+        line-height: 100px;
+        font-weight: 400;
+        color: #4a8bee;
+        font-size: 18px;
+        text-decoration: none;
+      }
+
+      .container {
+        margin: auto 20px;
+      }
+
+      .go-back {
+        display: none;
+      }
+    </style>
+  </head>
+
+  <body>
+    <a href="https://codechina.csdn.net/">
+      <img src="./files/404.svg" alt="404 Logo" />
+    </a>
+    <h1>404</h1>
+    <div class="container">
+      <h3>The page could not be found or you don't have permission to view it.</h3>
+      <hr />
+      <p>The resource that you are attempting to access does not exist or you don't have the necessary permissions to view it.</p>
+      <p>Make sure the address is correct and that the page hasn't moved.</p>
+      <p>Please contact your CODE CHINA administrator if you think this is a mistake.</p>
+      <a href="javascript:history.back()" class="js-go-back go-back" style="display: inline">Go back</a>
+    </div>
+    <script>
+      ;(function () {
+        var goBack = document.querySelector('.js-go-back')
+
+        if (history.length > 1) {
+          goBack.style.display = 'inline'
+        }
+      })()
+    </script>
+  </body>
+</html>
