<div class="parent-box">
  <div class="box-original">
    <div class="box-1"> </div>
  </div>

  <div class="box-original">
    <div class="box-2"> </div>
  </div>

  <div class="box-original">
    <div class="box-3"> </div>
  </div>
</div>
.parent-box {
  padding 10px;
  height: 90vh;
  background: lightgreen;
}

.box-original {
  border: 1px dotted gray;
  background-color: lightgray;
  width: 100px;
  height: 100px;
  text-align: center;
  align-self: center;
  margin: 10px;
}

.box-1 {
  border: 1px solid red;
  background-color: #111111;
  width: 100px;
  height: 100px;
  text-align: center;
  align-self: center;
  margin-left: -1px;
  margin-top: -1px;
}

.box-2 {
  position: static;
  top: 10px;
  left: 10px;
  border: 1px solid red;
  background-color: mediumpurple;
  width: 100px;
  height: 100px;
  text-align: center;
  align-self: center;
  margin-left: -1px;
  margin-top: -1px;
}

.box-3 {
  border: 1px solid red;
  background-color: #111111;;
  width: 100px;
  height: 100px;
  text-align: center;
  align-self: center;
  margin-left: -1px;
  margin-top: -1px;
}

External CSS

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External JavaScript

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