index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
    <div class="col-7 mt-5 mx-auto">
        <form action="/" class="form-control">
            <textarea name="text" placeholder="Enter words to check duplication and replitation" class="form-control" style="min-height: 300px;"></textarea>
    
            <div class="text-center mt-2">
                <button type="submit" class="btn btn-success btn-lg" >Check</button>

            </div>
        </form>
        <ul id="results" class="p-0">

        </ul>
    </div>
    <script type="module" src="/assets/js/script.js"></script>
</body>
</html>