test.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Test Chatbot</title>

    <style>
        * {
            box-sizing: border-box;
        }

        html,
        body {
            padding: 0;
            margin: 0;
        }


        iframe {
            min-height: 100vh;
            display: block;
            width: min(30rem , 100%);
            border-right: 1px solid #ccc;
            /* min-width: 30rem; */
        }


        /* @media (max-width: 768px) {
            iframe {
                width: min(30rem , 100%);
                min-width: 100%;
            }
        } */


        /* @media (max-width: 375px) {
            iframe {
                width: 100%;
                min-width: 100%;
            }
        } */

        @media (max-width: 600px) {}
    </style>
</head>

<body>
    <iframe src="http://127.0.0.1:8000/chat/" frameborder="0"></iframe></body>

</html>