Implements \Drupal\Core\Form\FormInterface::buildForm().
Overrides FormInterface::buildForm
public function buildForm(array $form, array &$form_state) {
$form['actions']['#type'] = 'actions';
$form['actions']['submit'] = array(
'#type' => 'submit',
'#value' => t('Save configuration'),
'#button_type' => 'primary',
);
// By default, render the form using theme_system_config_form().
$form['#theme'] = 'system_config_form';
return $form;
}