HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>option:checked</title>
  <style>
    option:checked {
      color: #dc2626;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <label for="fruit">Fruit</label>
  <select id="fruit" name="fruit">
    <option value="apple">Apple</option>
    <option value="grape" selected>Grape</option>
    <option value="pear">Pear</option>
  </select>
</body>
</html>

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CSS :checked Pseudo-class — option