   <link rel="stylesheet" href="/main.css">
    <title>Hello World</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            font-family: Arial, sans-serif;
            background:none;
        }
    </style>
</head>
<body>
    <!-- Dark theme script must be included after body tag-->
    <link rel="stylesheet" href="/darktheme.css">
    <script src="/script/darktheme.js"><