HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>#info:target</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    #info {
      display: none;
      margin-top: 12px;
      padding: 12px;
      border: 1px solid #cbd5e1;
    }

    #info:target {
      display: block;
    }
  </style>
</head>
<body>
  <a href="#info">Open info</a>
  <div id="info">
    Panel content
    <p><a href="#">Close</a></p>
  </div>
</body>
</html>

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CSS :target — show a panel