If you’ve learned CSS from the ground up, you should have a good understanding of the box model. But if you’re unfamiliar ...

HTML and CSS use a box model, which means that page elements include margins, padding, background colors and, optionally, decorative borders. Open your HTML Web page in a text editor such as Notepad.

How to Restrict the Content of a Div Tag in HTML. Creating a website using div elements and CSS for structure is ... The default behavior is "visible," which displays all content within the box.