Change the default margin and padding values for the <ul> list.
The font size of the list is 18px, the vertical margins should be the half the font-size (use em).
Left padding should be 10px.
The distance between each list item should be 10px. Use the bottom margin for this.

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index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Basic Data Structures</title>
  </head>
  <body>
    <h3>Some basic data structures are:</h3>
    <ul>
      <li>Stack</li>
      <li>Queue</li>
      <li>Binary Tree</li>
      <li>Heap</li>
    </ul>
  </body>
</html>