Change color of ion-header border

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:

   color: green;

   border-bottom-color: #ffa500 !important


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

   box-shadow: 0px 3px 0px #ff9100!important;