I'm using a third-part plugin that allows a user to create a grid of posts and open a post in a lightbox (the posts have VC elements inside the lightbox). When adding any custom css to that page or custom design options to an element (background color, custom padding, margins or border), the front end doesn't render the custom css. I can see that it adds the custom css class to the element but the inline style doesn't get added.
How does VC create those inline styles? I looked through the vc docs but cannot find this resource. Any ideas how I can render the custom css in inline style?