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CSS Z Index

The z-index property in CSS controls the stacking order of positioned elements along the z-axis (the depth axis), allowing you to place elements in front or behind others.

Basic Usage of the z-index Property

The z-index property takes a numeric value that determines the stacking order. Elements with a higher z-index value appear in front of elements with lower values.

Example

<!DOCTYPE html>
<html>

<head>
    <style>
        img {
            position: absolute;
            left: 0px;
            top: 0px;
            z-index: -1;
            width: 400px;
        }
    </style>
</head>

<body>

    <h1>The z-index Property</h1>

    <img src="https://static.additionalsheet.com/images//others/llogin.png" width="100" height="140">

    <p>Because the image has a z-index of -1, it will be placed behind the heading.</p>

</body>

</html>
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Benefits of Using z-index Property

  • Visual Hierarchy: Allows the control of the layering and arrangement of elements, establishing a visual hierarchy.
  • Depth Control: Defines which elements appear in front and which recede into the background.

Best Practices for Using z-index

  • Use Sparingly: Apply z-index only when necessary, as too many layers can complicate the layout.
  • Consistency: Maintain a consistent approach to the z-index values across the project for a predictable layering order.

Understanding and utilizing the z-index property provides control over the stacking order of elements, allowing you to create a more structured and visually pleasing layout in web design.

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