HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>option:default</title>
  <style>
    option:default {
      color: #dc2626;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <label for="city">City</label>
  <select id="city" name="city">
    <option value="">Choose</option>
    <option value="delhi" selected>Delhi</option>
    <option value="mumbai">Mumbai</option>
  </select>
</body>
</html>

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CSS :default Pseudo-class — option