index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Figurinhas</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="main.js"></script>
</head>
<body>
    <h1>Verificador de figurinhas</h1>
    <br><br>
    <div class="container">
        <input-group>
            <label>Figurinhas que faltam pra ti</label><br>
            <textarea id="faltam" cols="80" rows="10"></textarea><br>
            <label>Figurinhas que o amiguinho tem</label><br>
            <textarea id="repetidas" cols="80" rows="10"></textarea><br>
            <input type="button" id="submit1" value="Testar"></input><br><br>
            <h4>Você precisa dessas figurinhas</h4>
            <textarea id="result" cols="80" rows = "5"></textarea>
        </input-group>
    </div>
</body>
</html>