gap between navigation bar + product

Site URL: https://koala-recorder-yw4z.squarespace.com/config/pages

SS 7.1
How can I reduce the space between the header and the product image + title. I've hidden the breadcrumb trail so that might be adding to it. Is there some coding I need? Many thanks

Add to Design > Custom CSS

/* Nav gap */
section.products.collection-content-wrapper.product-layout-side-by-side {
    padding-top: 5px;
}