backend/views/site/login.php

<?php
    
    /**
     * @var string        $content
     * @var \yii\web\View $this
     */
    
    use hiqdev\assets\icheck\iCheckAsset;
    use yii\helpers\Html;
    use yii\web\View;
    use yii\widgets\ActiveForm;
    
    $bundle = yiister\gentelella\assets\Asset::register($this);
    
    $this->title = 'Логин';
    
    iCheckAsset::register($this);
    $js = <<< JS
$('input').iCheck({
checkboxClass: 'icheckbox_square-blue',
increaseArea: '20%' // optional
});
JS;
    $this->registerJs($js, View::POS_READY);
?>
<?php $this->beginPage(); ?>
<!DOCTYPE html>
<html lang="<?= Yii::$app->language ?>">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
  <meta charset="<?= Yii::$app->charset ?>"/>
  <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <?= Html::csrfMetaTags() ?>
  <title><?= Html::encode($this->title) ?></title>
    <?php $this->head() ?>
  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
  <!--[if lt IE 9]>
  <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
  <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
  <![endif]-->
</head>
<body>
<?php $this->beginBody(); ?>
<div class="container" style="background-color: #F7F7F7; height: 100%">
  <div class="row" style="margin-top: 10%">
    <div class="col-md-4 col-md-offset-4">
      <div class="site-login x_panel">
        <div class="x_title">
          <h1><?= Html::encode($this->title) ?></h1>
          <p>Please fill out the following fields to login:</p>
        </div>
        <div class="row">
          <div>
              <?php $form = ActiveForm::begin(
                  [
                      'id'             => 'login-form',
                      'validateOnBlur' => false,
                  ]
              ); ?>
              
              <?= $form->field($model, 'username')
                       ->textInput([ 'autofocus' => true ]) ?>
              
              <?= $form->field($model, 'password')
                       ->passwordInput() ?>
              
              <?= $form->field($model, 'rememberMe')
                       ->checkbox() ?>
            <div class="form-group">
                <?= Html::submitButton('Login',
                                       [
                                           'class' => 'btn btn-default',
                                           'name'  => 'login-button',
                                       ]
                ) ?>
            </div>
              
              <?php ActiveForm::end(); ?>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
<?php $this->endBody(); ?>
</body>
</html>
<?php $this->endPage(); ?>