<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
div{
  width: 100px;
  height: 100px;
  border: 1px solid black;
}
.box1{
  background-color: mediumseagreen;
}
.box2{
  background-color: lightcoral;
}
.box3{
  background-color: cornflowerblue;
}

External CSS

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External JavaScript

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