diff --git a/not_found.html b/not_found.html
index 3b8195e..1645b2e 100644
--- a/not_found.html
+++ b/not_found.html
@@ -1 +1,14 @@
-404 Not Found
\ No newline at end of file
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd" xml:lang="en">
+	<head>
+		<meta http-equiv="Content-type" content="application/xhtml+xml;charset=utf-8"/>
+		<meta name="viewport" content="width=device-width,initial-scale=1"/>
+		<link rel="icon" href = "images/favicon.ico"/>
+		<title>404 Not Found</title>
+		<link href="./style.css" rel="stylesheet" type="text/css" media="all"/>
+	</head>
+	<body>
+        <p>404 Not Found</p>
+    </body>
+</html>
\ No newline at end of file
