<details>
  <summary>Menu</summary>
  <div class="menu">
    <a href="">Menu item</a>
    <a href="">Menu item</a>
  </div>
</details>

details {
  font-size: 2em;
  font-family: sans-serif;
}

details a {
  display: block;
}

summary::-webkit-details-marker { 
  list-style: none;
  cursor: pointer;
  display: none;
}
Run Pen

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.