The Z-index Property

CSS Tutorial


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CSS Advanced


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CSS Responsive

CSS Grid

Z-index Property

The z-index property defines the order of the stack of an element.

When the position of the elements is set, they can overlap other elements.

The z-index property defines the stack order of an element.

HTML
CSS
				
					<h1>This is a heading</h1>
<img decoding="async" src="https://wallsdesk.com/wp-content/uploads/2017/01/Tel-Aviv-Photos.jpg" alt="Tel-Aviv-Photos">
<p>Because the image has a z-index of -1, it will be placed behind the text.</p>
				
			
				
					img {
  position: absolute;
  left: 0px;
  top: 0px;
  z-index: -1;
}
				
			

Output

z-index

Another z-index Example

It is observed that an element that has greater stack order is always above an element with a lower stack order:

				
					<h1>Z-index Example</h1>
<p>An element with greater stack order is always above an element with a lower stack order.</p>
<div class="container">
  <div class="black-box">Black box (z-index: 1)</div>
  <div class="gray-box">Gray box (z-index: 3)</div>
  <div class="box"> box (z-index: 2)</div>
</div>

				
			
CSS
				
					.container {
  position: relative;
}

.black-box {
  position: relative;
  z-index: 1;
  border: 2px solid black;
  height: 100px;
  margin: 30px;
}

.gray-box {
  position: absolute;
  z-index: 3; /* gray box will be above both green and black box */
  background: lightgray;
  height: 60px;  
  width: 70%;
  left: 50px;
  top: 50px;
}

.box {
  position: absolute;
  z-index: 2; /* box will be above black box */
  background: #03989E;
  width: 35%;
  left: 270px;
  top: -15px;
  height: 100px;
}
				
			

Output

z-index in css

Without z-index

If two positioned elements overlap each other without a z-index specified, the element defined last in the HTML code will be shown on top.

HTML
				
					<h1>Overlapping elements</h1>

<p>If two positioned elements overlap each other without a z-index specified,
the element defined last in the HTML code will be shown on top:</p>
<div class="container">
  <div class="black-box">Black box</div>
  <div class="gray-box">Gray box</div>
  <div class="box">box</div>

				
			
CSS
				
					.container {
  position: relative;
}

.black-box {
  position: relative;
  border: 2px solid black;
  height: 100px;
  margin: 30px;
}

.gray-box {
  position: absolute;
  background: lightgray;
  height: 60px;  
  width: 70%;
  left: 50px;
  top: 50px;
}

.box {
  position: absolute;
  background: #03989E;
  width: 35%;
  left: 270px;
  top: -15px;
  height: 100px;
}

				
			

Output

without z-index

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