Programmatically add class to views wrapper

function THEME_NAME_OR_MODULE_NAME_preprocess_views_view(&$variables){

    $view = $variables['view'];
    $id = $view->storage->id();

    if ($id == 'YOUR_VIEW_ID') {
      $variables['attributes'] = new Drupal\Core\Template\Attribute($variables['attributes']);
      $variables['attributes']->addClass('add you classes here');
    }

}