function my_custom_css() {
    $upload_dir = wp_upload_dir(); 
    $base_dir = wp_get_upload_dir(); 
    $styles = wp_get_custom_css();
    if ( $styles || is_customize_preview() ) :
        $type_attr = current_theme_supports( \'html5\', \'style\' ) ? \'\' : \' type="text/css"\';

        $file = file_put_contents($upload_dir[\'basedir\']."/new-style-function.css", strip_tags( $styles ) );
        move_uploaded_file($file, $upload_dir[\'baseurl\']);

    endif;
}

add_action( \'save_post\', \'my_custom_css\' );

$upload_path = wp_upload_dir(); 
wp_enqueue_style (\'custom-style\',$upload_path[\'baseurl\'] .\'/new-style-function.css\');

remove_action(\'wp_head\', \'wp_custom_css_cb\', 101);