<!doctype HTML>
<html>
    <head>
        <meta charset="utf-8">
        <title>Hello world!</title>
    </head>
    <body>
        <h1>Hello world!</h1>

        <div>
            <input id="username" type="text" placeholder="Nom d'utilisateur">
            <button id="button">Envoyer</button>
        </div>

        <script src="/main.js"></script>
    </body>
</html>