HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :checked + label Example</title>
  <style>
    input:checked + label {
      color: #1d4ed8;
      font-weight: 700;
    }

    label {
      color: #64748b;
      cursor: pointer;
      display: inline-block;
      margin-bottom: 0.65rem;
    }

    input {
      margin-right: 0.35rem;
      accent-color: #2563eb;
    }
  </style>
</head>
<body>
  <h1>Billing plan</h1>

  <div>
    <input type="radio" id="monthly" name="plan" value="monthly">
    <label for="monthly">Monthly plan</label>
  </div>

  <div>
    <input type="radio" id="yearly" name="plan" value="yearly" checked>
    <label for="yearly">Yearly plan (save 20%)</label>
  </div>
</body>
</html>

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CSS :checked Selector - Label Highlight