      body {
            display: grid;
            place-items: center;
            height: 100vh;
        }
    </style>
    <script type="module" src="./Content/WebSharper.Popover.Sample.head.js"></script>
</head>
<body>
    <h1>WebSharper.Popover sample page</h1>
    <div id="main">
    </div>

    <div ws-template="PopoverSample">
        <button class="trigger" id="open-btn" ws-onclick="TogglePopover">
            Open Popover(WS)
        </button>
        <div id="my-popover" popover=manual ws-onafte