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
This is a heading
Because the image has a z-index of -1, it will be placed behind the text.
img {
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
Output

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:
Z-index Example
An element with greater stack order is always above an element with a lower stack order.
Black box (z-index: 1)
Gray box (z-index: 3)
box (z-index: 2)
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

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
Overlapping elements
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:
Black box
Gray box
box
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
