accept_invitation.html

<html>

<head>
    <title>
        Accept Invitation
    </title>
    <style>
        #progress_bar {
            position: absolute;
            height: 100%;
            width: 100%;
            top: 0;
            left: 0;
            background: transparent;
            z-index: 1000;

        }
    </style>
    <script src="https://unpkg.com/blockstack@19.3.0/dist/blockstack.js"
        integrity="sha384-kscoAgc5pZqovHWSKndfyn3OeKHfRSh+Xc5wYc+E02BuyQV2zwEEHJ7p5drKnRrX"
        crossorigin="anonymous"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <script src="common.js"></script>
    <script src="static/js/script-invite.js"></script>
</head>

<body>
    <div id="progress_bar">
        <img style="position: absolute; height: 15%; width: 10%; top: 40%; left: 45%;" src="spin.gif" />
    </div>
</body>

</html>