摘要：
1）关键字：background-position: top left; 2）像素：background-position: 0px 0px; 3）百分比：background-position: 0% 0%; http://www.ruanyifeng.com/blog/2008/05/css_b 阅读全文
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摘要：
1）关键字：background-position: top left; 2）像素：background-position: 0px 0px; 3）百分比：background-position: 0% 0%; http://www.ruanyifeng.com/blog/2008/05/css_b 阅读全文
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