diff --git a/not_found_page.html b/not_found_page.html
index e69de29..aa59c96 100644
--- a/not_found_page.html
+++ b/not_found_page.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="tr">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Sayfa Bulunamadı</title>
+    <style>
+        body {
+            font-family: Arial, sans-serif;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            height: 100vh;
+            margin: 0;
+            background-color: #f8f8f8;
+        }
+        .container {
+            text-align: center;
+        }
+        h1 {
+            font-size: 72px;
+            margin: 0;
+            color: #333;
+        }
+        p {
+            font-size: 24px;
+            color: #666;
+        }
+        a {
+            color: #0066cc;
+            text-decoration: none;
+            font-size: 18px;
+        }
+        a:hover {
+            text-decoration: underline;
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>404</h1>
+        <p>Üzgünüz, aradığınız sayfa bulunamadı.</p>
+        <p><a href="/">Ana Sayfaya Dön</a></p>
+    </div>
+</body>
+</html>
