What are you trying to achieve:
I am using lighboxes to open when user clicks on text link, I want to lock the background scrolling and I want the user to be able to scroll within the light box, is it possible?
It’s not currently possible, so I’ll move this over to the Feedback category. In the meantime, be sure to submit a feature request on the Roadmap - Product Roadmap
@Maria_Montanez-Rudqu Hey! I did want to provide you with a workaround option for the time being in case it helps. While you can’t lock the background to prevent it scrolling, you can set the lightbox to scroll by adding a transparent container that’s docked to the bottom with a negative margin. (This creates content overflow inside the lightbox which will allow visitors to scroll.) Let us know if you have any questions on that!