Untitled

<!DOCTYPE html>
<html>

<head>
  <link href="style.css" rel="stylesheet" type="text/css" />
  <script src="script.js" defer></script>
</head>

<body>
  <div class="grandparent" id="grandparent-id">
    <div class="parent">
      <div class="child" id="child-one"></div>
      <div class="child"></div>
    </div>
    <div class="parent">
      <div class="child"></div>
      <div class="child"></div>
    </div>
  </div>
</body>

</html>
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