popup.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Moodle Breaker</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="assets/bootstrap.min.css">
    <link rel="stylesheet" href="assets/popup.css">
</head>
<body class="text-center">

<h1>Moodle</h1>
<hr>

<p>
    <button type="button" id="solve" class="btn btn-success btn-lg">Break it!</button>
</p>

<form id="optionForm">
    <p>
        <input type="checkbox" name="remember" id="remember">
        <label for="remember">
            <span></span>
            Answer instantly?
            <small id="saved"></small>
        </label>
    </p>
</form>

<p class="text-right"><button id="about" class="btn btn-sm btn-default">About</button></p>

<script src="src/popup.js"></script>

</body>
</html>