Change color burger menu and search icon in AMP Mode

/* Change color burger menu and search icon in AMP Mode */
function add_custom_css_for_amp_mode() {
    ?>
        .amp-wp-header.dark button,
        .amp-wp-header.dark .jeg_search_toggle {
            color: white;
        }
    <?php
}
add_action( 'amp_post_template_css', 'add_custom_css_for_amp_mode' );