HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS input ~ label Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      max-width: 20rem;
    }

    fieldset {
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
      padding: 1rem;
    }

    legend {
      font-weight: 700;
      color: #1e293b;
    }

    input[type="checkbox"] ~ label {
      display: block;
      margin-left: 1.5rem;
      color: #334155;
      font-size: 0.875rem;
      margin-bottom: 0.35rem;
    }

    input[type="checkbox"]:checked ~ label {
      color: #15803d;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <fieldset>
    <legend>Notifications</legend>
    <label for="notify">Enable alerts</label>
    <input type="checkbox" id="notify" checked>
    <label>Email alerts</label>
    <label>Push alerts</label>
  </fieldset>
</body>
</html>

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CSS General Sibling Selector - Checkbox Labels