use kilyalus\button\Button;
echo Button::widget([
'title' => 'label',
'icon' => 'fa fa-cog',
'iconPosition' => Button::ICON_POSITION_LEFT,
'type' => Button::TYPE_PRIMARY,
'size' => Button::SIZE_MINI,
'disabled' => false,
'block' => false,
'outline' => true,
'hover' => true,
'circle' => true,
'options' => [
'type' => 'submit'
],
])