<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calendar Merger</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        #calendars {
            margin-bottom: 20px;
        }
        #calendars .calendar {
            margin-bottom: 10px;
        }
        #calendars .calendar input[type="text"] {
            width: 50%;
            margin-right: 10px;
        }
        #calendars .calendar input[type="url"] {
            width: 50%;
        }
        #add-calendar {
            margin-bottom: 20px;
        }
    </style>
</head>
<body>
    <h1>Calendar Merger</h1>
    <form id="merge-form">
        <input type="text" id="link-group-name" placeholder="Link Group Name">
        <div id="calendars">
            <div class="calendar">
                <input type="text" id="prefix-0" placeholder="Prefix">
                <input type="checkbox" id="override-0">
                <label for="override-0">Override</label>
                <input type="url" id="url-0" placeholder="Calendar URL">
            </div>
        </div>
        <button id="add-calendar" type="button">Add Calendar</button>
        <button type="submit">Merge Calendars</button>
    </form>
    <div id="result"></div>

    <script src="script.js"></script>
</body>
</html>