Untitled

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
        <script>
            document.addEventListener('DOMContentLoaded', () => {

            });
        </script>
        <style>
            .dark-mode {
                background-color: rgba(0, 0, 0, 0.767);
                color: rgb(241, 241, 241);
            }
        </style>
    </head>
    <body>
        <button id="toggleBtn">To Dark Mode</button>
    </body>
</html>