Yii2. Kartik Select2 widget width -

my select2 control inside column bootstrap class 'col-sm-3'. attached form field. width not want 100% of parent column. if make browser window smaller (after columns auto-rearangment) select2 follows width of parent column. if specify width in px changes width. problem? same story form->field->textinput. found field width not follow parent column width if form inline.

<?= $form->field($model, 'categories')->widget(select2::classname(), [                 'data' => category::availablecategories(),                 'model' => $model,                 'attribute' => 'categories',                 'theme' => select2::theme_krajee,                 'size' => select2::medium,                 'showtoggleall' => false,                 'language' => 'en',                 'options' => ['placeholder' => 'select category...', 'id' => 'myselect'],                 'pluginoptions' => [                     'allowclear' => true,                     'multiple' => true,                     'width' => '200px',                     ],                 ])             ?> 

i had inline layout in form. problem.