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

An element with greater stack order is always in front of an element with a lower stack order.

Note: z-index only works on positioned elements (position: absolute, position: relative, position: fixed, or position: sticky).

HTML

<div class="main">
  <div class="common one">One</div>
  <div class="common two">Two</div>
  <div class="common three">Three</div>
  <div class="common four">Four</div>
  <div class="common five">Five</div>
  <div class="common six">Six</div>
</div>

CSS

body {
  font-family: "Courier New", Courier, monospace;
  margin: 0;
}

.main {
  margin: 0 auto;
}

.common {
  width: 200px;
  height: 200px;
  color: grey;
  border: 1px solid limegreen;
  position: absolute;
  color: black;
  font-weight: bold;
}

.one {
  background-color: red;
  z-index: 0;
  left: 20px;
  top: 40px;
}

.two {
  background-color: green;
  z-index: 1;
  left: 40px;
  top: 80px;
}

.three {
  background-color: blue;
  z-index: 2;
  left: 60px;
  top: 120px;
}

.four {
  background-color: brown;
  z-index: 3;
  left: 80px;
  top: 160px;
}

.five {
  background-color: deeppink;
  z-index: 4;
  left: 100px;
  top: 200px;
}

.six {
  background-color: yellow;
  z-index: 5;
  left: 120px;
  top: 240px;
}

You can check out the Demo.