The box model in CSS is a fundamental concept for designing and positioning elements on web pages. It consists of the following components:
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Content: This is the actual content area of the element, which can be text, images, or other media.
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Padding: This is the blank space between the content and the border.
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Border: This is the line frame around the padding and content, which can be customized with styles, width, and color.
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Margin: This is the blank space outside the border, used to separate elements.
The total width and height of the box include the content, padding, border, and margin. Understanding the box model is crucial for mastering CSS layout, especially when dealing with spatial relationships between elements and responsive design.