In 1s-bitrix (imopenlines_widget.css), it is connected for the feedback form. How to postpone the loading of these styles?

Question

css

The site includes a style (imopenlines_widget.css) for a widget from Bitrix24 (feedback form). How can I delay the loading of these styles? Google PageSpeed ​​recommends setting the "rel=preload"

attribute, I need to set the "rel='preload'" attribute. How can i do this