Change color of ion-header border

Ionic Framework ionic-v3
1

Hi i am new to ionic 2 , how do i change the bottom border of ion-header , i tried to bind the border-bottom-color to the ion-header element but it doesnt work

Below is my code for my scss:

top-news-page{
   
 h3{
   color: green;
  }

 ion-header{
   border-bottom-color: #ffa500 !important
  }

}
2

Managed to find the solution, just replace ion-header with the following:

.toolbar{
   box-shadow: 0px 3px 0px #ff9100!important;
}