ionic 3 item select background color

Whenever I select the item it becomes all yellow and I can not see which one was selected, it would be possible to change this yellow background to some other color

 <ion-item>
          <ion-select style="background-color: #fff"[(ngModel)]="option" value="limitado">
            <ion-option style="background-color: #fff" value="MERC">Transferencia</ion-option>
          </ion-select>
        </ion-item>