CSS Box Model

CSS Basic Box Model is a module of CSS that defines the rectangular boxes—including their padding and margin—that are generated for elements and laid out according to the visual formatting model.

Reference

Properties

Properties controlling the flow of content in a box

Properties controlling the size of a box

Properties controlling the margins of a box

Properties controlling the paddings of a box

Other properties

Guides

Introduction to the CSS box model

Explains one of the fundamental concept of CSS: the box model. This model defines how CSS lays out elements, including their content, padding, border, and margin areas.

Mastering margin collapsing

Sometimes, two adjacent margins are collapsed into one. This article describes the rules that govern when and why this happens, and how to control it.

Visual formatting model

Explains the visual formatting model.

Specifications