I am trying to remove the border under the `ion-refresher` element that appears when user pulls down. I have tried no-border no-shadow and custom css with `!important` but nothing seems to remove it, how can I remove the line under the ion-refresher that appears when a user pulls down

```
       <ion-refresher (ionRefresh)="doRefresh($event)" 
          no-border no-shadow style="border:none !important; box-shadow: none !important">
            <ion-refresher-content no-border no-shadow style="border:none !important">
            </ion-refresher-content>
       </ion-refresher>

```