--- a
+++ b/templates/error.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Error</title>
+    <!-- Bootstrap CSS link -->
+    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
+        integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"
+        crossorigin="anonymous">
+</head>
+<body>
+    <div class="container">
+        <h1 class="text-center text-danger">Error</h1>
+        <div class="alert alert-danger">
+            <p>{{ error }}</p>
+        </div>
+    </div>
+</body>
+</html>