Update the router

In the services/Router.js replace the go function

 go: (route, addToHistory=true) => {
    if (addToHistory) {
        history.pushState({ route }, '', route);
    }
    let pageElement = null;
    switch (route) {
        case "/":
            pageElement = document.createElement("menu-page");
            break;
        case "/order":
            pageElement = document.createElement("order-page");
            break;
        default:
            if (route.startsWith("/product-")) {                
                pageElement = document.createElement("details-page");
                pageElement.dataset.productId = route.substring(route.lastIndexOf("-")+1);
            }
            break;   
    }
    if (pageElement) {
        document.querySelector("main").innerHTML = "";
        document.querySelector("main").appendChild(pageElement);
    }

    window.scrollX = 0;
}

Check DevTools and Inspect the current HTML.