fix

src/components/ProductDetail.vue

 									<ion-icon slot="icon-only" :icon="addOutline"></ion-icon>
 								</ion-button>
 							</ion-item>
-							<ion-item lines="none">
-								<ion-button  color="danger">Add to cart</ion-button>
-							</ion-item>
 					</ion-grid>
+					<ion-button color="danger" expand="block">Add to cart</ion-button>
 				</ion-content>
 			</ion-modal>