HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS resolution Border Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    .card {
      padding: 1rem;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
      background: #fff;
    }

    @media (min-resolution: 2dppx) {
      .card {
        border-width: 0.5px;
      }
    }
  </style>
</head>
<body>
  <h1>Card</h1>
  <div class="card">
    <p>Hairline border on 2dppx Retina screens.</p>
  </div>
</body>
</html>

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CSS resolution - Hairline Border