1.写法
background-image: url(images/scroll_top.jpg),
url(images/scroll_bottom.jpg),
url(images/scroll_middle.jpg);
2.位置(分开写,逗号隔开)
background-position: center top, center bottom, center top;
3大小(分开写,逗号隔开)
background-size:75%,50%,cover;











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