yii2-bootstrap/apps/basic/views/site/login.php

<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;

/**
 * @var yii\base\View $this
 * @var yii\widgets\ActiveForm $form
 * @var app\models\LoginForm $model
 */
$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>

	<?php $form = ActiveForm::begin([
		'id' => 'login-form',
		'options' => ['class' => 'form-horizontal'],
		'fieldConfig' => [
			'template' => "{label}\n<div class=\"col-lg-3\">{input}</div>\n<div class=\"col-lg-8\">{error}</div>",
			'labelOptions' => ['class' => 'col-lg-1 control-label'],
		],
	]); ?>

	<?= $form->field($model, 'username') ?>

	<?= $form->field($model, 'password')->passwordInput() ?>

	<?=$form->field($model, 'rememberMe', [
		'template' => "<div class=\"col-lg-offset-1 col-lg-3\">{input}</div>\n<div class=\"col-lg-8\">{error}</div>",
	])->checkbox(); ?>

	<div class="form-group">
		<div class="col-lg-offset-1 col-lg-11">
			<?= Html::submitButton('Login', ['class' => 'btn btn-primary']) ?>
		</div>
	</div>

	<?php ActiveForm::end(); ?>

	<div class="col-lg-offset-1" 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>