Change Burger Menu Button

/* Add Javascript in Head */
function jnews_add_javascript () {
    ?>
    <script>
        jQuery(document).ready(function() {
            var button = '<button style="border-radius: 12px; font: initial; font-family: monospace;">menù</button>';
            jQuery('.toggle_btn.jeg_mobile_toggle').html(button);
        });
    </script>
    <?php
}

add_action( 'wp_head', 'jnews_add_javascript' );