<details>
  <summary>
    Awesome Summary (click me)
  </summary>
  But here's some more detailed information, just for you. Pretty neat!
</details>
details {
  margin-left: 1.5em;
}
summary {
  color: #099;
  cursor: pointer;
  text-indent: -1.3em;
}

/* ignore the rest */
body {
  background-color: #555;
  background-color: white;
  border: .5em solid #555;
  bottom: 0;
  font-family: sans-serif;
  font-size: 1.1em;
  left: 0;
  margin: 0;
  padding: 1em;
  position: absolute;
  right: 0;
  top: 0;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.