<div class="margin-bottom-100">
  아래 마진 100
</div>
<div></div>
<div></div>
<div class="margin-top-50">
  위 마진 50
</div>
.margin-bottom-100 {
  margin-bottom: 100px;
  height: 100px;
  background-color: yellow;
}
.margin-top-50 {
  margin-top: 50px;
  height: 50px;
  background-color: yellow;
}

External CSS

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External JavaScript

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