index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Connect-4</title>

    <link rel="stylesheet" href="css/style.css">

    <script src="js/script.js"></script>
</head>
<body onload="initAll()">
    <div class="row">
        <div id="pane"></div>
        <div id="settings">

            <label>Settings</label>

            <br />

            <select onchange="setGameMode(this.value)">
                <option value="1">Player vs AI</option>
                <option value="2">Player vs Player</option>
            </select>

            <br />

            <select onchange="setDifficulty(this.value)">
                <option value="1">Beginner</option>
                <option value="2">Intermediate</option>
                <option value="3">Professional</option>
                <option value="4">Expert</option>
            </select>

            <br />

            <button onclick="reset();">Reset</button>

            <br /><br /><br /><br /><br />

            <center id="thinking">
                <img src="img/loading.gif" title="Please wait..." width="75" height="75">
                <p>Please wait, <br> I'm thinking...</p>
            </center>
        </div>
    </div>
</body>
</html>