router/50x.html

<!DOCTYPE html>
<html>
    <head>
        <title>Error : Stencila</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="shortcut icon" type="image/png" href="https://unpkg.com/@stencila/hub/director/static/img/favicon.png">
        <link rel="stylesheet" type="text/css" href="https://unpkg.com/@stencila/hub/director/static/css/styles.css">
        <script src="https://browser.sentry-cdn.com/5.15.2/bundle.min.js" integrity="sha384-HA4Glk4hAwUFBIu+OfNR4bvn6vGCxT134gRiQce9rwp2YfxcuHHG8nG7qkooJwFt" crossorigin="anonymous"></script>
        <script>
            Sentry.init({ dsn: "https://6329017160394100b21be92165555d72@o18963.ingest.sentry.io/37250"});
            Sentry.captureException(new Error("50x error caught by Nginx"))
        </script>
    </head>
    <body>
        <section class="section">
            <div class="columns">
                <div class="column is-5 is-offset-4 has-text-centered">
                    <img class="error-image" src="https://unpkg.com/@stencila/hub@2.20.3/director/static/img/dead-document.svg" alt="Oh no!" width="112px" height="28px">
                    <h1 class="title has-margin-top">Oops!</h1>
                    <p>
                        Sorry, it seems that there is a problem with this page. Either we are doing maintainence, or it's a bug and our team has been notified and will fix it as soon as possible!
                    </p>
                    <br>
                    <p>
                        Please try later and/or check our <a href="https://status.stenci.la">status page</a>.
                    </p>
                    <br>
                    <p>
                        Stencila is an open source product. You can help make it better (and reduce these problems :) by <a href="https://github.com/stencila/hub#readme"> contributing</a> code, documentation,  ideas, bug reports etc. 💖.
                    </p>
                    <p style="margin-top:2em">
                        <img src="https://unpkg.com/@stencila/hub@2.20.3/director/static/img/logo-name.svg" alt="Stencila" width="220px">
                    </p>
                </div>
            </div>
        </section>
    </body>
</html>