Summary  
This chapter explains the CSS concept of block-level elements, covering their default `display: block` behavior, how to adjust their width, height, margins, borders and padding, and techniques for centering them within a parent container.

General domain of usage  
Web page layout and styling

**Block-level** elements are rectangular and stack on top of each other, preventing other elements from sharing the same line. This behavior is controlled by the CSS property `display: block`.

Key points about block-level elements:
- They default to `display: block`;
- Their width spans the full width of the parent container;
- Their height is determined by the content but can be customized with CSS;
- They always start on a new line;
- Properties like `border`, `margin`, `padding`, `width`, and `height` can be adjusted.

Let's explore an example where we manipulate `width`, `height`, and `margin`:

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Let's consider how we can center an element inside its parent.

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Working with Block-Level Elements

Awesome!

Working with Block-Level Elements