antshop/backend/views/site/login.php

<?php
/* @var $this yii\web\View */
/* @var $form yii\bootstrap\ActiveForm */
/* @var $model \backend\models\LoginForm */

use yii\helpers\Html;
use yii\bootstrap4\ActiveForm;

$this->title = '系统登录';
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="login-body">
    <div class="login-form col-md-3 offset-md-4">
        <h2><?= Html::encode($this->title) ?></h2>
        <h6 class="login-tips font-small-3 line text-muted"><span>Login with Blobt Admin</span></h6>
        <div class="row">
            <div class="col-lg-12">
                <?php $form = ActiveForm::begin(['id' => 'login-form']); ?>

                <?= $form->field($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-primary btn-lg btn-block', 'name' => 'login-button']) ?>
                </div>

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