Block-level elements can be identified as rectangular, and they stack on top of each other. They prevent any other elements from sharing the same line with them. This behavior is achieved by applying the CSS property:

Main considerations when working with block-level elements:

• They are inherently set to display: block;
• Their width spans the entire width allowed by the parent element;
• The height is initially determined by content, but it can be customized using CSS;
• Each block element starts on a new line;
• Properties like border, margin, padding, width, and height can be adjusted.

Now, let's explore an example where we manipulate width, height, and margin:

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