Copy and paste this HTML into your website code:
<iframe src="https://hiiker.app/trails/england/cornwall/knightor-via-wheal-martyn-trail/iframe" title="Knightor via Wheal Martyn Trail | Hiiker" referrerpolicy="origin-when-cross-origin" style="width: 100%; aspect-ratio: 4/3; max-width:800px;"></iframe>