diff --git a/public/stylesheets/login.scss b/public/stylesheets/login.scss
index 00db108..5d0c748 100644
--- a/public/stylesheets/login.scss
+++ b/public/stylesheets/login.scss
@@ -64,5 +64,12 @@ $primary: #d32f2f;
         display: none;
       }
     }
+
+    .ErrorMessage {
+      font-size: 1.3rem;
+      margin: 20px 0 0;
+      text-align: center;
+      color: red;
+    }
   }
 }
diff --git a/routes/cufs.js b/routes/cufs.js
index 4d2bdc1..dc2724f 100644
--- a/routes/cufs.js
+++ b/routes/cufs.js
@@ -7,12 +7,12 @@ router.get("/", function(req, res) {
 
 // GET login page
 router.get("/Default/Account/LogOn", function(req, res) {
-  res.render("login-form", { title: "login (Default)" });
+  res.render("login-form", { title: "Logowanie (Default)" });
 });
 
 // POST login
 router.post("/Default/Account/LogOn", function(req, res) {
-  res.json({"message": "Not implemented yet"});
+  res.render("login-form", { title: "Logowanie (Default)", message: "Zła nazwa użytkownika lub hasło" });
 });
 
 module.exports = router;
diff --git a/views/login-form.jade b/views/login-form.jade
index 32e2a89..618c212 100644
--- a/views/login-form.jade
+++ b/views/login-form.jade
@@ -26,3 +26,5 @@ block content
 
       div
          input(type="submit" value="Zaloguj się >")
+
+      div(class="ErrorMessage")= message