Modern Web Design with HTML5, CSS3, and JavaScript - Cascading Style Sheets (CSS) z-index and its Usage

The video tutorial explains the concept of z-index in CSS, which sets the stack order of positioned elements. It demonstrates how to use pseudo classes like nth-child to select and style elements based on their sibling position. The tutorial also covers practical applications of z-index to manage overlapping content, ensuring the correct stacking order of elements on a webpage.

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