diff --git a/public/404.php b/public/404.php
new file mode 100644
index 0000000..b7735e8
--- /dev/null
+++ b/public/404.php
@@ -0,0 +1,12 @@
+<!doctype html>
+<html>
+<head><meta charset="utf-8"><title>404 - Non trouvé</title>
+<link rel="stylesheet" href="/public/assets/style.css"></head>
+<body>
+<header><h1>404 — Page non trouvée</h1></header>
+<main>
+    <p>Désolé, la page demandée est introuvable.</p>
+    <p><a href="/public/index.php">Retour à l'accueil</a></p>
+</main>
+</body>
+</html>
