@media (max-width: 767px) {
    #html_element iframe {
        width: 100% !important;
        height: 180px !important; /* adjust height as needed */
    }
}

@media (min-width: 768px) {
    #html_element iframe {
        width: 100% !important;
        height: 230px !important; /* adjust height as needed */
    }
}