Hello,
yes Spiral theme does have popup shortcode, but it is not completely settled.
This is an example of how to use this shortcode in HTML:
<div class="tcvpb-popup-shadow" style="display: none;">
<div class="tcvpb-popup-content bottom_right" data-animation="flip" data-duration="1000" data-delay="300" style="display: block; position: fixed;">
<img src="image_example.jpg">
<p class="p_tc">Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old.</p>
<i class="tmf-close"></i>
</div>
</div>
this HTML should go to the very bottom of the page.
And now I can see that the entire CSS is missing for that shortcode, so we are sending you the CSS in attachments.
Please, let us know if that helped you.
Cheers