<div class="container">
  <div>
  </div>
</div>
.container {
  width: 500px;
  height: 250px;
  margin: auto;
  border: 5px solid;
  overflow: auto;
}
.container > div {
  width: calc(100% + 40px*9);
  height: calc(100% + 40px*4);
}

External CSS

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External JavaScript

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