HTML Code

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

    fieldset:disabled {
      opacity: 0.6;
      border: 1px dashed #94a3b8;
      border-radius: 0.5rem;
      padding: 1rem;
      max-width: 18rem;
    }

    fieldset:disabled legend {
      color: #64748b;
      font-weight: 600;
    }

    fieldset:disabled input {
      display: block;
      width: 100%;
      margin-top: 0.5rem;
      padding: 0.5rem 0.75rem;
      border: 1px solid #cbd5e1;
      border-radius: 0.35rem;
      cursor: not-allowed;
    }

    fieldset:not(:disabled) {
      border: 1px solid #22c55e;
      border-radius: 0.5rem;
      padding: 1rem;
      max-width: 18rem;
    }
  </style>
</head>
<body>
  <h1>Checkout</h1>

  <fieldset disabled>
    <legend>Shipping (unavailable)</legend>
    <input type="text" placeholder="Address">
    <input type="text" placeholder="City">
  </fieldset>

  <br>

  <fieldset>
    <legend>Billing (active)</legend>
    <input type="text" placeholder="Card number">
  </fieldset>
</body>
</html>

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CSS :disabled Selector - Fieldset