CodePen Embed - margin collapsing

<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>


div {
  width: 100px;
  height: 100px;
  color: #fff;
  text-align: center;
  line-height: 100px;
  font-size: 2rem;
  margin: 20px;
}

div:nth-child(1) {
  background-color: royalblue;
}

div:nth-child(2) {
  background-color: gold;
}

div:nth-child(3) {
  background-color: crimson;
}

div:nth-child(4) {
  background-color: forestgreen;
  margin-top: 50px;
}

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