CodePen Embed - oNpBLoL

<div class="parent">
  <div class="child"></div>
</div>

.parent {
  width: 200px;
  height: 150px;
  background-color: royalblue;
  margin: 20px;
  overflow: auto;
}
.child {
  width: 300px;
  height: 100px;
  background-color: orange;
}

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