<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LIFF Starter</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <div class="buttongroup">
        <div class="buttonrow">
            <button id="openwindowbutton">Open Window</button>
            <button id="closewindowbutton">Close Window</button>
        </div>
        <div class="buttonrow">
            <button id="getaccesstoken">Get Access Token</button>
            <button id="getprofile