只有垂直方向重复background-image - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    body {
      background-image: url("/examples/paper.gif");
      background-repeat: repeat-y;
    }
  </style>
</head>

<body>
  <p>repeat-y 设置只有垂直方向重复 background-image</p>
</body>
</html>
        