Progress Widget - Error Display Percent %

Hi everybody!

I have used \yii\bootstrap\Progress widget as following:

echo yii\bootstrap\Progress ::widget([

                            'percent' => 0,


                            'options' =>['style'=>'margin-bottom:0px;']


                        ]);

The percent value is 0, but its background-color for percent is > 0%, seem this is default value.

Anybody have any ideas ? Thanks.