safaribook-knockout-essentials/ko-cart/views/header.html

    <h1>Catalog</h1>

    <button
        class="btn btn-primary btn-sm"
        data-toggle="modal"
        data-target="#addToCatalogModal"
    >
        Add New Product
    </button>
    <button
        class="btn btn-primary btn-sm"
        data-bind="toggle:visibleCart, css:{ disabled: cart().length  < 1}"
    >
        Show Cart Details
    </button>
    <hr />