Yii 2 set Gridview Content horizontal vertical centering

[
    'attribute'=>'yiilib',
    'value'=>function ($model) { return $model->yii.'<br/>'.$model->lib; },
    'filter'=>false,
    'format'=>'raw',
    'label'=>'YiiLib.com',
    'headerOptions' => ['width' => '300px'],
    'contentOptions' => ['style'=>'padding:0px 0px 0px 30px;vertical-align: middle;'],
],

The key is use "contentOptions" to set style to display content