Control which element appears on top.
✍️ 3 exercises + code challenge in this lessonWhen positioned elements overlap, z-index decides which one is in front. A higher value is closer to the viewer.
z-index only works on positioned elements (relative, absolute, fixed, sticky) and on flex/grid items.Mastering CSS Z-index helps you write clean and reliable CSS code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<style>
.card { position: absolute; width: 120px; height: 80px; color: white; padding: 8px; border-radius: 8px; }
.one { background: #2563EB; top: 20px; left: 20px; z-index: 3; }
.two { background: #14B8A6; top: 50px; left: 70px; z-index: 2; }
.three { background: #E34F26; top: 80px; left: 120px; z-index: 1; }
</style>
<div style="position: relative; height: 190px;">
<div class="card one">z-index: 3</div>
<div class="card two">z-index: 2</div>
<div class="card three">z-index: 1</div>
</div>Check what you learned in “CSS Z-index”.
Put the modal in front of other positioned elements.
.modal {
position: fixed;
: 100;
}
z-index works on…
Give .top a z-index of 10 so it appears above .bottom.
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