<?=\yii\bootstrap\Button::widget([
'label' => Yii::t('app', 'Add to list'),
'options' => ['class' => 'btn btn_small btn_green'],
]);?>
<span class="btn btn_small btn_green"><?= Yii::t('app', 'Add to list'); ?></span>
<?=\yii\bootstrap\Button::widget([
'label' => Yii::t('app', 'Add to list'),
'options' => ['class' => 'btn btn_small btn_green'],
]);?>