HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>outline: none</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .shown {
      outline: 3px solid #2563eb;
      border: 1px solid #cbd5e1;
      padding: 12px;
      max-width: 16rem;
      margin-bottom: 16px;
      background: #f8fafc;
      font-weight: 700;
    }

    .hidden {
      outline: none;
      border: 1px solid #cbd5e1;
      padding: 12px;
      max-width: 16rem;
      background: #f8fafc;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>Second box uses <strong>outline: none</strong>. On real controls, pair that only with a visible focus style.</p>
  <div class="shown">outline visible</div>
  <div class="hidden">outline: none</div>
</body>
</html>

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CSS outline Property — none