diff --git a/server_files/403.php b/server_files/403.php
index 51e6852..72127d0 100644
--- a/server_files/403.php
+++ b/server_files/403.php
@@ -4,9 +4,13 @@ require_once "config.php";
 require_once "views/header.php";
 
 http_response_code(403);
+?>
 
-echo "<h1>Vous n'êtes pas autorisé à accéder à cette page.</h1>";
+    <div class="alert alert-danger mt-4 mb-4">
+        <h2 class="display-5">
+            Vous n'êtes pas autorisé à accéder à cette page.
+        </h2>
+    </div>
 
-require_once "views/footer.php";
-
-exit();
\ No newline at end of file
+<?php
+require_once "views/footer.php";
\ No newline at end of file
diff --git a/server_files/404.php b/server_files/404.php
index 9fc419b..1724071 100644
--- a/server_files/404.php
+++ b/server_files/404.php
@@ -4,9 +4,13 @@ require_once "config.php";
 require_once "views/header.php";
 
 http_response_code(404);
+?>
 
-echo "<h1>Cette page n'existe pas.</h1>";
+    <div class="alert alert-danger mt-4 mb-4">
+        <h2 class="display-5">
+            Cette page n'existe pas.
+        </h2>
+    </div>
 
-require_once "views/footer.php";
-
-exit();
\ No newline at end of file
+<?php
+require_once "views/footer.php";
\ No newline at end of file