I am new to web design and I'm trying to figure out how the z-index property works and what it is utilized for. Currently, I am working on positioning a drop-down menu and have read that the z-index can be helpful in such scenarios. Any assistance or explanation would be greatly appreciated!
One valuable resource for understanding z-index is the documentation:
The z-index property determines the stacking order of elements and their children. When elements overlap, the z-index decides which element appears on top. Typically, an element with a higher z-index will cover one with a lower z-index.
In the case of a positioned box, the z-index property defines:
The position of the box in the current stacking context.
Whether the box creates a local stacking context.
Illustrative example:
.dashed-box {
position: relative;
z-index: 1;
border: dashed;
height: 8em;
margin-bottom: 1em;
margin-top: 2em;
}
.gold-box {
position: absolute;
z-index: 3;
/* .gold-box overlaps .green-box and .dashed-box */
background: gold;
width: 80%;
left: 60px;
top: 3em;
}
.green-box {
position: absolute;
z-index: 2;
/* .green-box overlaps .dashed-box */
background: lightgreen;
width: 20%;
left: 20em;
top: -25px;
height: 7em;
opacity: 0.9;
}<div class="dashed-box">Dashed box
<span class="gold-box">Gold box</span>
<span class="green-box">Green box</span>
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