          <ion-back-button color="medium"></ion-back-button>
          <ion-back-button color="dark"></ion-back-button>
        </p>
        <p>
          <ion-back-button color="primary" class="ion-focused"></ion-back-button>
          <ion-back-button color="secondary" class="ion-focused"></ion-back-button>
          <ion-back-button color="tertiary" class="ion-focused"></ion-back-button>
          <ion-back-button color="success" class="ion-focused"></ion-back-button>
          <ion-back-button color="wa