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<!DOCTYPE html> <html> <head> <style> body { background-image: url('img_girl.jpg'); background-repeat: no-repeat; background-attachment: fixed; background-size: 100% 100%; } </style> </head> <body> <h2>背景拉伸</h2> <p>将 background-size 属性设置为“100% 100%”，背景图像将被拉伸以覆盖整个元素，在本例中为 body 元素。</p> </body> </html>