index.html

<html>

<head>
    <script type="text/javascript">

        const queryString = window.location.search;
        const urlParams = new URLSearchParams(queryString);
        const status = urlParams.get('status')

        window.onload = function() {
            const celement = document.getElementById("content")
            var bcolor = "red"
            if (status == "1") {
                celement.innerHTML = "You are out!";
            } else if (status == "2") {
                celement.innerHTML = "You are in!";
                bcolor = "green"
            }
            document.getElementById("cbody").style['background-color'] = bcolor;
        }

    </script>
</head>
<body id="cbody">
    <div id="content" style='font-size: 3em; color: white; text-align: center; margin-top: 3em; font-weight: bold;'>
        Waiting for status
    </div>
</body>

</html>