<div class="item1">z-index: 2</div>
<div class="item2">z-index: 4</div>
<div class="item3">z-index: 6</div>
<div class="item4">z-index: 4</div>
<div class="item5">z-index: 2</div>

<div class="item">Try to change the z-index of this box</div>
div {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: x-large;
  text-align: center;
  padding: 20px;
  border: 1px solid orange;
  background-color: bisque;

  position: absolute;
}

.item {
  top: 0px;
  left: 0px;
  height: 300px;

  border: 1px solid skyblue;
  background-color: lightblue;

  /*   z-index: 0; */
}

.item1 {
  top: 0px;
  left: 0px;

  z-index: 2;
}

.item2 {
  top: 50px;
  left: 50px;

  z-index: 4;
}

.item3 {
  top: 100px;
  left: 100px;

  z-index: 6;
}

.item4 {
  top: 150px;
  left: 50px;

  z-index: 4;
}

.item5 {
  top: 200px;
  left: 0px;

  z-index: 2;
}
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