CSS- z-index | CSS for Beginners - Class 6 PDF Download
CSS Layout - The z-index Property
The z-index property specifies the stack order of an element.
The z-index Property
When elements are positioned, they can overlap other elements.
The z-index property specifies the stack order of an element (which element should be placed in front of, or behind, the others).
An element can have a positive or negative stack order:
Example
img {
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
Note: z-index only works on positioned elements (position: absolute, position: relative, position: fixed, or position: sticky) and flex items (elements that are direct children of display: flex elements).
Another z-index Example
Example
Here we see that an element with greater stack order is always above an element with a lower stack order:
<html>
<head>
<style>
.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;
background: lightgray;
height: 60px;
width: 70%;
left: 50px;
top: 50px;
}
.green-box {
position: absolute;
z-index: 2;
background: lightgreen;
width: 35%;
left: 270px;
top: -15px;
height: 100px;
}
</style>
</head>
<body>
<div class="container">
<div class="black-box">Black box</div>
<div class="gray-box">Gray box</div>
<div class="green-box">Green box</div>
</div>
</body>
</html>
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.
Example
Same example as above, but here with no z-index specified:
<html>
<head>
<style>
.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;
}
.green-box {
position: absolute;
background: lightgreen;
width: 35%;
left: 270px;
top: -15px;
height: 100px;
}
</style>
</head>
<body>
<div class="container">
<div class="black-box">Black box</div>
<div class="gray-box">Gray box</div>
<div class="green-box">Green box</div>
</div>
</body>
</html>
Test Yourself With Exercises
Exercise:
Both the header and the paragraph are positioned at the top of the page.
Make sure that the header is placed on top of the paragraph.
<style>
_____ {
position: absolute;
top: 0;
_____ : 1;
}
_____ {
position: absolute;
top: 0;
_____ : 0;
}
</style>
<body>
<h1 id="mytitle">This is a heading</h1>
<p id="myintro">This is a paragraph</p>
</body>
<style>
#mytitle {
position: absolute;
top: 0;
z-index: 1;
}
#myintro {
position: absolute;
top: 0;
z-index : 0;
}
</style>
<body>
<h1 id="mytitle">This is a heading</h1>
<p id="myintro">This is a paragraph</p>
</body>
CSS Property
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Nov 19, 2024 Last updated |
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