diff --git a/docs/401.html b/docs/401.html
new file mode 100644
index 0000000..98c0f32
--- /dev/null
+++ b/docs/401.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <title> 401 &ndash; Unauthorized </title>
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="stylesheet" href="./custom-error-page.css" />
+</head>
+
+<body>
+<div class="container">
+    <div class="left">
+        <svg
+            width="300"
+            height="300"
+            viewBox="0 0 300 300"
+            xmlns="http://www.w3.org/2000/svg"
+        >
+            <path
+                d="M153.01 33.2a6 6 0 0 1 2.18 2.18l129.7 223.61a6 6 0 0 1-5.19 9.01H20.3a6 6 0 0 1-5.2-9.01L144.8 35.38a6 6 0 0 1 8.21-2.18ZM150.02 204a14.01 14.01 0 1 0-.02 28.02 14.01 14.01 0 0 0 .02-28.02Zm4.8-89h-9.65a6 6 0 0 0-6 6.17l1.5 52a6 6 0 0 0 6 5.83h6.67a6 6 0 0 0 6-5.83l1.48-52a6 6 0 0 0-6-6.17Z"
+                fill="#000"
+                fill-rule="evenodd"
+            />
+        </svg>
+    </div>
+    <div class="right">
+        <div class="text-container">
+            <h1 class="code">
+                401
+            </h1>
+            <div class="status">
+                Unauthorized
+            </div>
+            <div class="description">
+                Your browser sent a request that the server was unable
+                to process.
+            </div>
+            <div class="footer">
+                Nginx at example.com
+            </div>
+        </div>
+    </div>
+</div>
+</body>
+</html>
