docker/rootfs/var/www/html/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">
        <title>Default Site</title>
        <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
        <style>
            .jumbotron { margin-top: 50px; }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="jumbotron">
                <h1>Congratulations!</h1>
                <p>You've successfully started the Nginx Proxy Manager.</p>
                <p>If you're seeing this site then you're trying to access a host that isn't set up yet.</p>
                <p>Log in to the Admin panel to get started.</p>
            </div>
            <p class="text-center"><small>Powered by <a href="https://github.com/jc21/nginx-proxy-manager" target="_blank">Nginx Proxy Manager</a></small></p>
        </div>
    </body>
</html>