<div class="flex">
  <div class="ellipse"></div>
</div>
.flex {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.ellipse {
  width: 200px;
  height: 100px;
  display: block;
  background-color: #fa8072;
  border: 1px solid #fa8072;
  border-radius: 100px / 50px;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.