Здравствуйте, хочу что бы подсказали как внедрить HTML в карточку товара product.php
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Daily UI #016 | Pop-Up / Overlay</title>
<link href="https://fonts.googleapis.com/css?family=Nunito:300,400,400i,700" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel="stylesheet" href="/catalog/model/popup_okno/css/style.css">
</head>
<body>
<a href="#" class='btn open-modal' data-modal="#modal1">Open Modal</a>
<div class='modal' id='modal1'>
<div class='content'>
<h1 class='title'>This is a modal</h1>
<p>
Here is some text and stuff. cool cool
</p>
<a class='btn close-modal' data-modal="#modal1" href="#">K Bye</a>
</div>
</div>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js'></script>
<script src="/catalog/model/popup_okno/js/index.js"></script>
</body>
</html>