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CSS background-position 属性
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<!DOCTYPE html> <html> <head> <style> body { background-image: url('/demo/images/w3css.gif'); background-repeat: no-repeat; background-attachment: fixed; background-position: center top; } </style> </head> <body> <h1>The background-position Property</h1> <p>Here, the background image will be positioned centered at top.</p> </body> </html>