diff --git a/index.html b/index.html
new file mode 100644
index 00000000..a31f73b4
--- /dev/null
+++ b/index.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Error</title>
+  <style>
+    * {
+      margin: 0;
+      padding: 0;
+    }
+
+    main {
+      display: flex;
+      flex-direction: column;
+      justify-content: center;
+      align-items: center;
+      height: 100vh;
+      color: #333;
+      font-size: 20px;
+      font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;
+    }
+
+    .gap {
+      height: 2%;
+    }
+  </style>
+</head>
+<body>
+  <main>
+    <div>请将 Web 根目录设为当前目录下的 public 目录。</div>
+    <div class="gap"></div>
+    <div>
+      Please define your web server root directory as the "public" directory under current directory.
+    </div>
+  </main>
+</body>
+</html>
