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// alert('Hello world!');

<div class="box box-a">
    BOX A
</div>
<div class="box box-b">
    BOX B
</div>

.box {
  height: 100px;
}
.box-a {
  margin-bottom: 40px;
  background-color: palegreen;
}
.box-b {
  margin-top: 20px;
  background-color: skyblue;
}



body {
  padding: 100px 0;
  font-size: 24px;
}