<div>
  <div id="parent">
    <div id="child"></div>
  </div>
</div>
* {
  margin: 0;
  padding: 0;
}

#parent {
  width: 200px;
  height: 200px;
  margin-top: 20px;
  background-color: pink;
  overflow: hidden;
}

#child {
  width: 100px;
  height: 100px;
  margin-top: 30px;
  background-color: skyblue;
}
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