diff --git a/config/web.php b/config/web.php
index 5dff3da..21580b4 100644
--- a/config/web.php
+++ b/config/web.php
@@ -13,7 +13,6 @@ $config = [
     ],
     'components' => [
         'request' => [
-            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
             'cookieValidationKey' => 'wyfZNsArEJYqB8EzG5Ag7kphYr_KDZqb',
         ],
         'cache' => [
diff --git a/models/ContactForm.php b/models/ContactForm.php
deleted file mode 100644
index f001d21..0000000
--- a/models/ContactForm.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-namespace app\models;
-
-use Yii;
-use yii\base\Model;
-
-/**
- * ContactForm is the model behind the contact form.
- */
-class ContactForm extends Model
-{
-    public $name;
-    public $email;
-    public $subject;
-    public $body;
-    public $verifyCode;
-
-
-    /**
-     * @return array the validation rules.
-     */
-    public function rules()
-    {
-        return [
-            // name, email, subject and body are required
-            [['name', 'email', 'subject', 'body'], 'required'],
-            // email has to be a valid email address
-            ['email', 'email'],
-            // verifyCode needs to be entered correctly
-            ['verifyCode', 'captcha'],
-        ];
-    }
-
-    /**
-     * @return array customized attribute labels
-     */
-    public function attributeLabels()
-    {
-        return [
-            'verifyCode' => 'Verification Code',
-        ];
-    }
-
-    /**
-     * Sends an email to the specified email address using the information collected by this model.
-     * @param string $email the target email address
-     * @return bool whether the model passes validation
-     */
-    public function contact($email)
-    {
-        if ($this->validate()) {
-            Yii::$app->mailer->compose()
-                ->setTo($email)
-                ->setFrom([Yii::$app->params['senderEmail'] => Yii::$app->params['senderName']])
-                ->setReplyTo([$this->email => $this->name])
-                ->setSubject($this->subject)
-                ->setTextBody($this->body)
-                ->send();
-
-            return true;
-        }
-        return false;
-    }
-}
diff --git a/models/LoginForm.php b/models/LoginForm.php
deleted file mode 100644
index dce15cc..0000000
--- a/models/LoginForm.php
+++ /dev/null
@@ -1,81 +0,0 @@
-<?php
-
-namespace app\models;
-
-use Yii;
-use yii\base\Model;
-
-/**
- * LoginForm is the model behind the login form.
- *
- * @property-read User|null $user
- *
- */
-class LoginForm extends Model
-{
-    public $username;
-    public $password;
-    public $rememberMe = true;
-
-    private $_user = false;
-
-
-    /**
-     * @return array the validation rules.
-     */
-    public function rules()
-    {
-        return [
-            // username and password are both required
-            [['username', 'password'], 'required'],
-            // rememberMe must be a boolean value
-            ['rememberMe', 'boolean'],
-            // password is validated by validatePassword()
-            ['password', 'validatePassword'],
-        ];
-    }
-
-    /**
-     * Validates the password.
-     * This method serves as the inline validation for password.
-     *
-     * @param string $attribute the attribute currently being validated
-     * @param array $params the additional name-value pairs given in the rule
-     */
-    public function validatePassword($attribute, $params)
-    {
-        if (!$this->hasErrors()) {
-            $user = $this->getUser();
-
-            if (!$user || !$user->validatePassword($this->password)) {
-                $this->addError($attribute, 'Incorrect username or password.');
-            }
-        }
-    }
-
-    /**
-     * Logs in a user using the provided username and password.
-     * @return bool whether the user is logged in successfully
-     */
-    public function login()
-    {
-        if ($this->validate()) {
-            return Yii::$app->user->login($this->getUser(), $this->rememberMe ? 3600*24*30 : 0);
-        }
-        return false;
-    }
-
-    /**
-     * Finds user by [[username]]
-     *
-     * @return User|null
-     */
-    public function getUser()
-    {
-        if ($this->_user === false) {
-            $this->_user = User::findByUsername($this->username);
-        }
-
-        return $this->_user;
-    }
-}
diff --git a/views/layouts/main.php b/views/layouts/main.php
index c204435..a215667 100644
--- a/views/layouts/main.php
+++ b/views/layouts/main.php
@@ -23,58 +23,27 @@ $this->registerLinkTag(['rel' => 'icon', 'type' => 'image/x-icon', 'href' => Yii
 <!DOCTYPE html>
 <html lang="<?= Yii::$app->language ?>" class="h-100">
 <head>
-    <title><?= Html::encode($this->title) ?></title>
-    <?php $this->head() ?>
+	<title><?= Html::encode($this->title) ?></title>
+	<?php $this->head() ?>
 </head>
 <body class="d-flex flex-column h-100">
 <?php $this->beginBody() ?>
 
 <header id="header">
-    <?php
-    NavBar::begin([
-        'brandLabel' => Yii::$app->name,
-        'brandUrl' => Yii::$app->homeUrl,
-        'options' => ['class' => 'navbar-expand-md navbar-dark bg-dark fixed-top']
-    ]);
-    echo Nav::widget([
-        'options' => ['class' => 'navbar-nav'],
-        'items' => [
-            ['label' => 'Home', 'url' => ['/site/index']],
-            ['label' => 'About', 'url' => ['/site/about']],
-            ['label' => 'Contact', 'url' => ['/site/contact']],
-            Yii::$app->user->isGuest
-                ? ['label' => 'Login', 'url' => ['/site/login']]
-                : '<li class="nav-item">'
-                    . Html::beginForm(['/site/logout'])
-                    . Html::submitButton(
-                        'Logout (' . Yii::$app->user->identity->username . ')',
-                        ['class' => 'nav-link btn btn-link logout']
-                    )
-                    . Html::endForm()
-                    . '</li>'
-        ]
-    ]);
-    NavBar::end();
-    ?>
 </header>
 
 <main id="main" class="flex-shrink-0" role="main">
-    <div class="container">
-        <?php if (!empty($this->params['breadcrumbs'])): ?>
-            <?= Breadcrumbs::widget(['links' => $this->params['breadcrumbs']]) ?>
-        <?php endif ?>
-        <?= Alert::widget() ?>
-        <?= $content ?>
-    </div>
+	<div class="container">
+		<?= Alert::widget() ?>
+		<?= $content ?>
+	</div>
 </main>
 
 <footer id="footer" class="mt-auto py-3 bg-light">
-    <div class="container">
-        <div class="row text-muted">
-            <div class="col-md-6 text-center text-md-start">&copy; My Company <?= date('Y') ?></div>
-            <div class="col-md-6 text-center text-md-end"><?= Yii::powered() ?></div>
-        </div>
-    </div>
+	<div class="container">
+		<div class="row text-muted">
+		</div>
+	</div>
 </footer>
 
 <?php $this->endBody() ?>
diff --git a/views/site/about.php b/views/site/about.php
deleted file mode 100644
index ea006ec..0000000
--- a/views/site/about.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-/** @var yii\web\View $this */
-
-use yii\helpers\Html;
-
-$this->title = 'About';
-$this->params['breadcrumbs'][] = $this->title;
-?>
-<div class="site-about">
-    <h1><?= Html::encode($this->title) ?></h1>
-
-    <p>
-        This is the About page. You may modify the following file to customize its content:
-    </p>
-
-    <code><?= __FILE__ ?></code>
-</div>
diff --git a/views/site/contact.php b/views/site/contact.php
deleted file mode 100644
index 597fabc..0000000
--- a/views/site/contact.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/** @var yii\web\View $this */
-/** @var yii\bootstrap5\ActiveForm $form */
-/** @var app\models\ContactForm $model */
-
-use yii\bootstrap5\ActiveForm;
-use yii\bootstrap5\Html;
-use yii\captcha\Captcha;
-
-$this->title = 'Contact';
-$this->params['breadcrumbs'][] = $this->title;
-?>
-<div class="site-contact">
-    <h1><?= Html::encode($this->title) ?></h1>
-
-    <?php if (Yii::$app->session->hasFlash('contactFormSubmitted')): ?>
-
-        <div class="alert alert-success">
-            Thank you for contacting us. We will respond to you as soon as possible.
-        </div>
-
-        <p>
-            Note that if you turn on the Yii debugger, you should be able
-            to view the mail message on the mail panel of the debugger.
-            <?php if (Yii::$app->mailer->useFileTransport): ?>
-                Because the application is in development mode, the email is not sent but saved as
-                a file under <code><?= Yii::getAlias(Yii::$app->mailer->fileTransportPath) ?></code>.
-                Please configure the <code>useFileTransport</code> property of the <code>mail</code>
-                application component to be false to enable email sending.
-            <?php endif; ?>
-        </p>
-
-    <?php else: ?>
-
-        <p>
-            If you have business inquiries or other questions, please fill out the following form to contact us.
-            Thank you.
-        </p>
-
-        <div class="row">
-            <div class="col-lg-5">
-
-                <?php $form = ActiveForm::begin(['id' => 'contact-form']); ?>
-
-                    <?= $form->field($model, 'name')->textInput(['autofocus' => true]) ?>
-
-                    <?= $form->field($model, 'email') ?>
-
-                    <?= $form->field($model, 'subject') ?>
-
-                    <?= $form->field($model, 'body')->textarea(['rows' => 6]) ?>
-
-                    <?= $form->field($model, 'verifyCode')->widget(Captcha::class, [
-                        'template' => '<div class="row"><div class="col-lg-3">{image}</div><div class="col-lg-6">{input}</div></div>',
-                    ]) ?>
-
-                    <div class="form-group">
-                        <?= Html::submitButton('Submit', ['class' => 'btn btn-primary', 'name' => 'contact-button']) ?>
-                    </div>
-
-                <?php ActiveForm::end(); ?>
-
-            </div>
-        </div>
-
-    <?php endif; ?>
-</div>
diff --git a/views/site/login.php b/views/site/login.php
deleted file mode 100644
index db003c0..0000000
--- a/views/site/login.php
+++ /dev/null
@@ -1,55 +0,0 @@
-<?php
-
-/** @var yii\web\View $this */
-/** @var yii\bootstrap5\ActiveForm $form */
-
-/** @var app\models\LoginForm $model */
-
-use yii\bootstrap5\ActiveForm;
-use yii\bootstrap5\Html;
-
-$this->title = 'Login';
-$this->params['breadcrumbs'][] = $this->title;
-?>
-<div class="site-login">
-    <h1><?= Html::encode($this->title) ?></h1>
-
-    <p>Please fill out the following fields to login:</p>
-
-    <div class="row">
-        <div class="col-lg-5">
-
-            <?php $form = ActiveForm::begin([
-                'id' => 'login-form',
-                'fieldConfig' => [
-                    'template' => "{label}\n{input}\n{error}",
-                    'labelOptions' => ['class' => 'col-lg-1 col-form-label mr-lg-3'],
-                    'inputOptions' => ['class' => 'col-lg-3 form-control'],
-                    'errorOptions' => ['class' => 'col-lg-7 invalid-feedback'],
-                ],
-            ]); ?>
-
-            <?= $form->field($model, 'username')->textInput(['autofocus' => true]) ?>
-
-            <?= $form->field($model, 'password')->passwordInput() ?>
-
-            <?= $form->field($model, 'rememberMe')->checkbox([
-                'template' => "<div class=\"custom-control custom-checkbox\">{input} {label}</div>\n<div class=\"col-lg-8\">{error}</div>",
-            ]) ?>
-
-            <div class="form-group">
-                <div>
-                    <?= Html::submitButton('Login', ['class' => 'btn btn-primary', 'name' => 'login-button']) ?>
-                </div>
-            </div>
-
-            <?php ActiveForm::end(); ?>
-
-            <div style="color:#999;">
-                You may login with <strong>admin/admin</strong> or <strong>demo/demo</strong>.<br>
-                To modify the username/password, please check out the code <code>app\models\User::$users</code>.
-            </div>
-
-        </div>
-    </div>
-</div>