diff --git a/.env.develop b/.env.develop
index e6cfe04..968fd4b 100644
--- a/.env.develop
+++ b/.env.develop
@@ -1,7 +1,23 @@
 # .env.development: Environment variables for local development
 
-# Set composer cache directory
+# composer: Set cache directory
 COMPOSER_CACHE_DIR=./.composer
 
-# Disable Twig cache
+# MariaDB container
+MYSQL_RANDOM_ROOT_PASSWORD=yes
+MYSQL_DATABASE=mailusers
+MYSQL_USER=mailaccountadmin
+MYSQL_PASSWORD=mailaccountadmin
+
+# App settings
+APP_DEBUG=true
+
+# - Disable Twig cache
 TWIG_CACHE_DIR=
+TWIG_STRICT=true
+
+# - Database credentials
+DB_HOST=db
+DB_DATABASE=mailusers
+DB_USER=mailaccountadmin
+DB_PASSWORD=mailaccountadmin
diff --git a/docker-compose.yml b/docker-compose.yml
index f91cc48..f742930 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -12,3 +12,21 @@ services:
     volumes:
       - ./:/var/www/
     user: ${DOCKER_UID}
+
+  db:
+    image: mariadb
+    env_file:
+      - .env.develop
+    ports:
+      - 13306:3306
+    volumes:
+      - db_data:/var/lib/mysql
+      - ./sql/init_tables.sql:/docker-entrypoint-initdb.d/init_tables.sql:ro
+
+  adminer:
+    image: adminer
+    ports:
+      - 8099:8080
+
+volumes:
+  db_data:
diff --git a/public/index.php b/public/index.php
index 34eb697..37641db 100644
--- a/public/index.php
+++ b/public/index.php
@@ -9,11 +9,13 @@ use MailAccountAdmin\Routes;
 use MailAccountAdmin\Settings;
 use Slim\Factory\AppFactory;
 
+session_start();
+
 $settings = new Settings();
 $container = Dependencies::createContainer($settings);
 $app = AppFactory::createFromContainer($container);
 
-Middlewares::setMiddlewares($app);
+Middlewares::setMiddlewares($app, $settings);
 Routes::setRoutes($app);
 
 $app->run();
diff --git a/public/static/style.css b/public/static/style.css
new file mode 100644
index 0000000..6db3384
--- /dev/null
+++ b/public/static/style.css
@@ -0,0 +1,50 @@
+html, body {
+    max-width: 100%;
+    margin: 0;
+    padding: 0;
+}
+
+* {
+    box-sizing: border-box;
+}
+
+body {
+    font-family: sans-serif;
+}
+
+/* --- Header --- */
+header {
+    margin: 1em;
+}
+
+header h1 {
+    margin: 1em;
+}
+
+/* --- Login page --- */
+main.login_page {
+    margin: 2em;
+    padding: 1em;
+    border: 1px gray solid;
+    width: auto;
+}
+
+main.login_page h2 {
+    margin: 0 0 0.5em 0;
+}
+
+main.login_page table td {
+    padding: 0.2em;
+}
+
+/* --- Text and other styling --- */
+.error {
+    background: #ff4444;
+    width: 30em;
+    margin: 1em 0;
+    padding: 1em;
+}
+
+button {
+    padding: 0.2em 1em;
+}
diff --git a/sql/init_tables.sql b/sql/init_tables.sql
new file mode 100644
index 0000000..f45577d
--- /dev/null
+++ b/sql/init_tables.sql
@@ -0,0 +1,50 @@
+-- Create tables
+
+SET NAMES utf8mb4;
+
+-- TODO create on prod
+CREATE TABLE `admin_users`
+(
+    `admin_id`    int(10) unsigned    NOT NULL AUTO_INCREMENT,
+    `username`    varchar(255)        NOT NULL,
+    `password`    varchar(255)        NOT NULL,
+    `is_active`   tinyint(3) unsigned NOT NULL DEFAULT 1,
+    `created_at`  datetime            NOT NULL DEFAULT NOW(),
+    `modified_at` datetime            NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (`admin_id`),
+    UNIQUE KEY `username` (`username`)
+) DEFAULT CHARSET = utf8mb4;
+
+-- Create initial admin user for development (password is 'admin')
+INSERT INTO `admin_users`
+    (`username`, `password`, `is_active`, `created_at`, `modified_at`)
+VALUES ('admin', '$2y$10$zaNOBUk4PBlhDZD40h35CeyUxiqixi9LTrxlAxnrckXd95hcCctl6', '1', NOW(), NOW());
+
+-- TODO rename on prod `users` -> `mail_users`
+CREATE TABLE `mail_users`
+(
+    `user_id`     int(10) unsigned    NOT NULL AUTO_INCREMENT,
+    `username`    varchar(255)        NOT NULL,
+    `password`    varchar(255)        NOT NULL,
+    `is_active`   tinyint(3) unsigned NOT NULL DEFAULT 1,
+    `home_dir`    varchar(255)        NOT NULL,
+    `memo`        text                         DEFAULT NULL,
+    `created_at`  datetime            NOT NULL DEFAULT NOW(),
+    `modified_at` datetime            NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (`user_id`),
+    UNIQUE KEY `username` (`username`)
+) DEFAULT CHARSET = utf8mb4;
+
+CREATE TABLE `mail_aliases`
+(
+    `alias_id`     int(10) unsigned NOT NULL AUTO_INCREMENT,
+    `user_id`      int(10) unsigned NOT NULL,
+    `mail_address` varchar(255)     NOT NULL,
+    `created_at`   datetime         NOT NULL DEFAULT NOW(),
+    `modified_at`  datetime         NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (`alias_id`),
+    UNIQUE KEY `mail_address` (`mail_address`),
+    KEY `user_id` (`user_id`),
+    -- TODO rename on prod `users` -> `mail_users`
+    CONSTRAINT `mail_aliases_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `mail_users` (`user_id`)
+) DEFAULT CHARSET = utf8mb4;
diff --git a/src/Auth/AuthMiddleware.php b/src/Auth/AuthMiddleware.php
new file mode 100644
index 0000000..6738f6e
--- /dev/null
+++ b/src/Auth/AuthMiddleware.php
@@ -0,0 +1,36 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Auth;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Slim\Psr7\Response;
+
+class AuthMiddleware implements MiddlewareInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $uri = $request->getUri();
+
+        // TODO: Lots of stuff. Session middleware, auth handler class, etc...
+        if ($uri->getPath() !== '/login') {
+            // Check authorization via session
+            // TODO username or user ID?
+            if (empty($_SESSION['username'])) {
+                // Not logged in -> Redirect to /login
+                $response = new Response();
+                return $response
+                    ->withHeader('Location', '/login')
+                    ->withStatus(303);
+            }
+        }
+
+        return $handler->handle($request);
+    }
+}
diff --git a/src/Common/UserHelper.php b/src/Common/UserHelper.php
new file mode 100644
index 0000000..e67f56b
--- /dev/null
+++ b/src/Common/UserHelper.php
@@ -0,0 +1,33 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Common;
+
+use http\Exception\RuntimeException;
+use MailAccountAdmin\Models\AdminUser;
+use MailAccountAdmin\Repositories\AdminUserRepository;
+
+class UserHelper
+{
+    /** @var AdminUserRepository */
+    private $adminUserRepository;
+
+    public function __construct(AdminUserRepository $adminUserRepository)
+    {
+        $this->adminUserRepository = $adminUserRepository;
+    }
+
+    public function isLoggedIn(): bool
+    {
+        return !empty($_SESSION['username']);
+    }
+
+    public function getCurrentUser(): AdminUser
+    {
+        $username = $_SESSION['username'] ?? null;
+        if (empty($username)) {
+            throw new RuntimeException('Not logged in!');
+        }
+        return $this->adminUserRepository->getUserByName($username);
+    }
+}
diff --git a/src/Dependencies.php b/src/Dependencies.php
index d82b70a..9f2e901 100644
--- a/src/Dependencies.php
+++ b/src/Dependencies.php
@@ -4,15 +4,20 @@ declare(strict_types=1);
 namespace MailAccountAdmin;
 
 use DI\Container;
-use MailAccountAdmin\Login\LoginController;
+use MailAccountAdmin\Common\UserHelper;
+use MailAccountAdmin\Frontend\Login\LoginController;
+use MailAccountAdmin\Frontend\Dashboard\DashboardController;
+use MailAccountAdmin\Repositories\AdminUserRepository;
+use PDO;
 use Psr\Container\ContainerInterface;
 use Slim\Views\Twig;
 
 class Dependencies
 {
-    private const SETTINGS = 'settings';
-    private const TWIG = 'view';
+    public const SETTINGS = 'settings';
+    public const TWIG = 'view';
     private const TWIG_TEMPLATE_DIR = __DIR__ . '/../templates';
+    public const DATABASE = 'database';
 
     public static function createContainer(Settings $settings): Container
     {
@@ -29,10 +34,50 @@ class Dependencies
             return Twig::create(self::TWIG_TEMPLATE_DIR, $settings->getTwigSettings());
         });
 
-        // Login, registration, authentication
+        // Database connection
+        $container->set(self::DATABASE, function (ContainerInterface $c) {
+            /** @var Settings $settings */
+            $settings = $c->get(self::SETTINGS);
+            $dbSettings = $settings->getDatabaseSettings();
+
+            return new PDO(
+                "mysql:dbname={$dbSettings['dbname']};host={$dbSettings['host']};port={$dbSettings['port']}",
+                $dbSettings['username'],
+                $dbSettings['password'],
+                [
+                    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+                ],
+            );
+        });
+
+        // Repositories
+        $container->set(AdminUserRepository::class, function (ContainerInterface $c) {
+            return new AdminUserRepository(
+                $c->get(self::DATABASE),
+            );
+        });
+
+        // Helper classes
+        $container->set(UserHelper::class, function (ContainerInterface $c) {
+            return new UserHelper(
+                $c->get(AdminUserRepository::class),
+            );
+        });
+
+        // Login page
         $container->set(LoginController::class, function (ContainerInterface $c) {
             return new LoginController(
-                $c->get(self::TWIG)
+                $c->get(self::TWIG),
+                $c->get(UserHelper::class),
+                $c->get(AdminUserRepository::class),
+            );
+        });
+
+        // Dashboard
+        $container->set(DashboardController::class, function (ContainerInterface $c) {
+            return new DashboardController(
+                $c->get(self::TWIG),
+                $c->get(UserHelper::class),
             );
         });
 
diff --git a/src/Exceptions/AdminUserNotFoundException.php b/src/Exceptions/AdminUserNotFoundException.php
new file mode 100644
index 0000000..413b5ff
--- /dev/null
+++ b/src/Exceptions/AdminUserNotFoundException.php
@@ -0,0 +1,8 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Exceptions;
+
+class AdminUserNotFoundException extends AppException
+{
+}
diff --git a/src/Exceptions/AppException.php b/src/Exceptions/AppException.php
new file mode 100644
index 0000000..7519b94
--- /dev/null
+++ b/src/Exceptions/AppException.php
@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Exceptions;
+
+use RuntimeException;
+
+class AppException extends RuntimeException
+{
+}
diff --git a/src/Frontend/BaseController.php b/src/Frontend/BaseController.php
new file mode 100644
index 0000000..894488d
--- /dev/null
+++ b/src/Frontend/BaseController.php
@@ -0,0 +1,21 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Frontend;
+
+use MailAccountAdmin\Common\UserHelper;
+use Slim\Views\Twig;
+
+class BaseController
+{
+    /** @var Twig */
+    protected $view;
+    /** @var UserHelper */
+    protected $userHelper;
+
+    public function __construct(Twig $view, UserHelper $userHelper)
+    {
+        $this->view = $view;
+        $this->userHelper = $userHelper;
+    }
+}
diff --git a/src/Frontend/Dashboard/DashboardController.php b/src/Frontend/Dashboard/DashboardController.php
new file mode 100644
index 0000000..7538686
--- /dev/null
+++ b/src/Frontend/Dashboard/DashboardController.php
@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Frontend\Dashboard;
+
+use MailAccountAdmin\Frontend\BaseController;
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+
+class DashboardController extends BaseController
+{
+    public function showDashboard(Request $request, Response $response): Response
+    {
+        $currentUser = $this->userHelper->getCurrentUser();
+
+        $renderData = [
+            'username' => $currentUser->getUsername(),
+            'user' => $currentUser,
+        ];
+
+        return $this->view->render($response, 'dashboard.html.twig', $renderData);
+    }
+}
diff --git a/src/Frontend/Login/LoginController.php b/src/Frontend/Login/LoginController.php
new file mode 100644
index 0000000..f486c44
--- /dev/null
+++ b/src/Frontend/Login/LoginController.php
@@ -0,0 +1,80 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Frontend\Login;
+
+use MailAccountAdmin\Common\UserHelper;
+use MailAccountAdmin\Exceptions\AdminUserNotFoundException;
+use MailAccountAdmin\Frontend\BaseController;
+use MailAccountAdmin\Repositories\AdminUserRepository;
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Slim\Views\Twig;
+
+class LoginController extends BaseController
+{
+    /** @var AdminUserRepository */
+    private $adminUserRepository;
+
+    public function __construct(Twig $view, UserHelper $userHelper, AdminUserRepository $adminUserRepository)
+    {
+        parent::__construct($view, $userHelper);
+        $this->adminUserRepository = $adminUserRepository;
+    }
+
+    private function renderLoginPage(Response $response, array $renderData = []): Response
+    {
+        return $this->view->render($response, 'login.html.twig', $renderData);
+    }
+
+    public function showLoginPage(Request $request, Response $response): Response
+    {
+        if ($this->userHelper->isLoggedIn()) {
+            // Already logged in, redirect to dashboard
+            return $response
+                ->withHeader('Location', '/')
+                ->withStatus(303);
+        }
+
+        return $this->renderLoginPage($response);
+    }
+
+    public function authenticateUser(Request $request, Response $response): Response
+    {
+        $params = (array)$request->getParsedBody();
+
+        if (empty($params['username'])) {
+            return $this->renderLoginPage($response, ['error' => 'Missing username!']);
+        } elseif (empty($params['password'])) {
+            return $this->renderLoginPage($response, ['error' => 'Missing password!']);
+        }
+
+        $loginUsername = $params['username'];
+        $loginPassword = $params['password'];
+
+        try {
+            $user = $this->adminUserRepository->getUserByName($loginUsername);
+        }
+        catch (AdminUserNotFoundException $e) {
+            $user = null;
+        }
+
+        if ($user !== null && password_verify($loginPassword, $user->getPasswordHash())) {
+            $_SESSION['username'] = $user->getUsername();
+            return $response
+                ->withHeader('Location', '/')
+                ->withStatus(303);
+        } else {
+            return $this->renderLoginPage($response, ['error' => 'Wrong username or password!']);
+        }
+    }
+
+    public function logoutUser(Request $request, Response $response): Response
+    {
+        session_destroy();
+
+        return $response
+            ->withHeader('Location', '/login')
+            ->withStatus(303);
+    }
+}
diff --git a/src/Login/LoginController.php b/src/Login/LoginController.php
deleted file mode 100644
index c0bc80c..0000000
--- a/src/Login/LoginController.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace MailAccountAdmin\Login;
-
-use Psr\Http\Message\ResponseInterface as Response;
-use Psr\Http\Message\ServerRequestInterface as Request;
-use Slim\Views\Twig;
-
-class LoginController
-{
-    /** @var Twig */
-    private $view;
-
-    public function __construct(Twig $view)
-    {
-        $this->view = $view;
-    }
-
-    public function showLoginPage(Request $request, Response $response): Response
-    {
-        $renderData = [
-        ];
-
-        return $this->view->render($response, 'login.html', $renderData);
-    }
-}
diff --git a/src/Middlewares.php b/src/Middlewares.php
index cbadfc7..375e481 100644
--- a/src/Middlewares.php
+++ b/src/Middlewares.php
@@ -3,13 +3,18 @@ declare(strict_types=1);
 
 namespace MailAccountAdmin;
 
+use MailAccountAdmin\Auth\AuthMiddleware;
 use Slim\App;
 use Slim\Views\TwigMiddleware;
 
 class Middlewares
 {
-    public static function setMiddlewares(App $app): void
+    public static function setMiddlewares(App $app, Settings $settings): void
     {
+        $displayErrorDetails = $settings->isDebugMode();
+
+        $app->addErrorMiddleware($displayErrorDetails, true, true);
+        $app->add(new AuthMiddleware());
         $app->add(TwigMiddleware::createFromContainer($app));
     }
 }
diff --git a/src/Models/AdminUser.php b/src/Models/AdminUser.php
new file mode 100644
index 0000000..cef9c7b
--- /dev/null
+++ b/src/Models/AdminUser.php
@@ -0,0 +1,75 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Models;
+
+use DateTimeImmutable;
+
+class AdminUser
+{
+    /** @var int */
+    private $id;
+    /** @var string */
+    private $username;
+    /** @var string */
+    private $passwordHash;
+    /** @var bool */
+    private $active;
+    /** @var DateTimeImmutable */
+    private $createdAt;
+    /** @var DateTimeImmutable */
+    private $modifiedAt;
+
+    private function __construct(int $id, string $username, string $passwordHash, bool $isActive,
+                                 DateTimeImmutable $createdAt, DateTimeImmutable $modifiedAt)
+    {
+        $this->id = $id;
+        $this->username = $username;
+        $this->passwordHash = $passwordHash;
+        $this->active = $isActive;
+        $this->createdAt = $createdAt;
+        $this->modifiedAt = $modifiedAt;
+    }
+
+    public static function createFromArray(array $data): self
+    {
+        return new self(
+            (int)$data['admin_id'],
+            $data['username'],
+            $data['password'],
+            $data['is_active'] === '1',
+            new DateTimeImmutable($data['created_at']),
+            new DateTimeImmutable($data['modified_at']),
+        );
+    }
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function getUsername(): string
+    {
+        return $this->username;
+    }
+
+    public function getPasswordHash(): string
+    {
+        return $this->passwordHash;
+    }
+
+    public function isActive(): bool
+    {
+        return $this->active;
+    }
+
+    public function getCreatedAt(): DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function getModifiedAt(): DateTimeImmutable
+    {
+        return $this->modifiedAt;
+    }
+}
diff --git a/src/Repositories/AdminUserRepository.php b/src/Repositories/AdminUserRepository.php
new file mode 100644
index 0000000..31e2a41
--- /dev/null
+++ b/src/Repositories/AdminUserRepository.php
@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Repositories;
+
+use MailAccountAdmin\Exceptions\AdminUserNotFoundException;
+use MailAccountAdmin\Models\AdminUser;
+use PDO;
+
+class AdminUserRepository
+{
+    /** @var PDO */
+    private $pdo;
+
+    public function __construct(PDO $pdo)
+    {
+        $this->pdo = $pdo;
+    }
+
+    /**
+     * @throws AdminUserNotFoundException
+     */
+    public function getUserByName(string $username): AdminUser
+    {
+        $statement = $this->pdo->prepare('SELECT * FROM admin_users WHERE username = :username LIMIT 1');
+        $statement->execute(['username' => $username]);
+
+        if ($statement->rowCount() < 1) {
+            throw new AdminUserNotFoundException("Admin with username '$username' was not found.");
+        }
+
+        $row = $statement->fetch(PDO::FETCH_ASSOC);
+        return AdminUser::createFromArray($row);
+    }
+}
diff --git a/src/Routes.php b/src/Routes.php
index 9c7520a..a90372f 100644
--- a/src/Routes.php
+++ b/src/Routes.php
@@ -3,13 +3,20 @@ declare(strict_types=1);
 
 namespace MailAccountAdmin;
 
-use MailAccountAdmin\Login\LoginController;
+use MailAccountAdmin\Frontend\Dashboard\DashboardController;
+use MailAccountAdmin\Frontend\Login\LoginController;
 use Slim\App;
 
 class Routes
 {
     public static function setRoutes(App $app): void
     {
-        $app->get('/', LoginController::class . ':showLoginPage');
+        // Login
+        $app->get('/login', LoginController::class . ':showLoginPage');
+        $app->post('/login', LoginController::class . ':authenticateUser');
+        $app->get('/logout', LoginController::class . ':logoutUser');
+
+        // Dashboard
+        $app->get('/', DashboardController::class . ':showDashboard');
     }
 }
diff --git a/src/Settings.php b/src/Settings.php
index b36160f..ca111a0 100644
--- a/src/Settings.php
+++ b/src/Settings.php
@@ -5,12 +5,27 @@ namespace MailAccountAdmin;
 
 class Settings
 {
+    public function isDebugMode(): bool
+    {
+        return getenv('APP_DEBUG') === 'true';
+    }
+
     public function getTwigSettings(): array
     {
-        $cacheDir = getenv('TWIG_CACHE_DIR');
-
         return [
-            'cache' => !empty($cacheDir) ? $cacheDir : false,
+            'cache' => getenv('TWIG_CACHE_DIR') ?: false,
+            'strict_variables' => getenv('TWIG_STRICT') === 'true',
+        ];
+    }
+
+    public function getDatabaseSettings(): array
+    {
+        return [
+            'host' => getenv('DB_HOST') ?: 'localhost',
+            'port' => getenv('DB_PORT') ?: 3306,
+            'dbname' => getenv('DB_DATABASE') ?: '',
+            'username' => getenv('DB_USER') ?: '',
+            'password' => getenv('DB_PASSWORD') ?: '',
         ];
     }
 }
diff --git a/templates/base.html.twig b/templates/base.html.twig
new file mode 100644
index 0000000..916fab1
--- /dev/null
+++ b/templates/base.html.twig
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>{% block title %}Untitled page{% endblock %} - MailAccountAdmin</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="/static/style.css">
+</head>
+
+<body>
+
+<header>
+    <h1>MailAccountAdmin</h1>
+</header>
+
+<main>
+    {% block content %}
+        Nothing to see here...
+    {% endblock %}
+</main>
+
+</body>
+</html>
diff --git a/templates/dashboard.html.twig b/templates/dashboard.html.twig
new file mode 100644
index 0000000..cf4cb89
--- /dev/null
+++ b/templates/dashboard.html.twig
@@ -0,0 +1,20 @@
+{% extends "base.html.twig" %}
+
+{% block title %}Dashboard{% endblock %}
+
+{% block content %}
+    <h2>Dashboard</h2>
+
+    <p>Hello, {{ username }}!</p>
+
+    <pre>
+        ID: {{ user.getId() }}
+        username: {{ user.getUsername() }}
+        password: {{ user.getPasswordHash() }}
+        is_active: {{ user.isActive() }}
+        created_at: {{ user.getCreatedAt() | date() }}
+        modified_at: {{ user.getModifiedAt() | date() }}
+    </pre>
+
+    <a href="/logout">Logout.</a>
+{% endblock %}
diff --git a/templates/login.html b/templates/login.html
deleted file mode 100644
index e46301d..0000000
--- a/templates/login.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <title>MailAccountAdmin</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <!-- <link rel="stylesheet" href=""> -->
-</head>
-
-<body>
-
-<h1>MailAccountAdmin - Login</h1>
-
-<b>Hello.</b>
-
-<!-- <script src="" async defer></script> -->
-
-</body>
-</html>
diff --git a/templates/login.html.twig b/templates/login.html.twig
new file mode 100644
index 0000000..b22a5b8
--- /dev/null
+++ b/templates/login.html.twig
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>Login - MailAccountAdmin</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="/static/style.css">
+</head>
+
+<body>
+
+<header>
+    <h1>MailAccountAdmin</h1>
+</header>
+
+<main class="login_page">
+    <h2>Login</h2>
+
+    <form action="/login" method="POST">
+        {% if error is defined %}
+        <div class="error">{{ error }}</div>
+        {% endif %}
+
+        <table>
+            <tr>
+                <td><label for="username">Username</label></td>
+                <td><input type="text" id="username" name="username"></td>
+            </tr>
+            <tr>
+                <td><label for="password">Password</label></td>
+                <td><input type="password" id="password" name="password"></td>
+            </tr>
+            <tr>
+                <td></td>
+                <td><button type="submit">Login</button></td>
+            </tr>
+        </table>
+    </form>
+</main>
+
+</body>
+</html>