<!DOCTYPE html>
<html>
<head>
<style>
body {
background-image: url("/i/css/gradient_bg.png");
background-repeat: repeat-x;
}
</style>
</head>
<body>
<h1>Hello World!</h1>
<p>在这里，背景图像仅在水平方向上重复！</p>
</body>
</html>