I am trying to move to table less css. I want my background to be the negative space of a rounded rectangle that fills the page. The positive space will be white and the content will go inside, the negative space will be orange. The model for what I want to replicate for shape is Is there a way to round the corners when you add a background color, is it a container, or is it an image and the content goes on top of not inside of it? I look at the code but don't understand where the shape comes from, and I'm new at this so I'm having trouble on my own.