index.html

<!DOCTYPE html>
<html lang="en">

<head><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.css">
    <meta charset="UTF-8" />
    <link rel="stylesheet" href="style.css" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Portrait Matting demo</title>
</head>

<body>
    <main class="container">
        <label class="custom-file-select">
            <input id="file-select" type="file" accept="image/*" />
            select image
        </label>
        <p id="status"></p>
        <div class="wrap">
            <div id="image-container" class="left-column"></div>
            <div id="output-container" class="right-column"></div>    
        </div>
    </main>
    <script src="./index.js" type="module"></script>
</body>

</html>