为所有选中的输入元素设置背景颜色 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    input:checked {
      background: #ff0000;
    }
  </style>
</head>
<body>

  <form action="">
    <input type="radio" checked="checked" value="male" name="gender" /> Male<br>
    <input type="radio" value="female" name="gender" /> Female<br>
    <input type="checkbox" checked="checked" value="Bike" /> I have a bike<br>
    <input type="checkbox" value="Car" /> I have a car
  </form>

</body>
</html>
        