HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS option:default Example</title>
  <style>
    select {
      padding: 0.5rem 0.75rem;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      font-size: 1rem;
      min-width: 200px;
    }

    option:default {
      font-weight: 700;
      color: #1d4ed8;
    }
  </style>
</head>
<body>
  <label for="country">Select a country:</label>
  <select id="country">
    <option value="us" selected>United States (default)</option>
    <option value="uk">United Kingdom</option>
    <option value="in">India</option>
  </select>
</body>
</html>

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CSS :default Selector - Default Select Option