HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>gap in flexbox</title>
  <style>
    section {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
  </style>
</head>
<body>
  <section>
    <div>A</div>
    <div>B</div>
    <div>C</div>
    <div>D</div>
  </section>
</body>
</html>

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CSS gap Property — flex