Here is an example of a Primer lightbox.
Primer offers a robust editor for you to create lightboxes.
Lightboxes and other Primer widgets are shown to your website visitors according to the conditions that you create. Conditions determine the circumstances under which a lightbox is displayed. A lightbox must have at least one condition set in order for it to be eligible for display. Multiple conditions can be grouped into Rulesets which can then be reused with other lightboxes. Because lightbox conditions can become complex, Master Rules are available to help ensure that lightboxes are displayed as you expect them to.
You create conditions within the Primer interface by using the Edit link in the Conditions column.
You can test your lightboxes before publishing them to your production website. Read more about testing lightboxes in QA Mode.
You can run AB and Multivariate Tests within Primer. These tests allow you to determine which variation of a lightbox is the most effective.