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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> div { width: 100%; height: 400px; background-image: url('img_flowers.jpg'); background-size: cover; border: 1px solid red; } </style> </head> <body> <p>调整浏览器窗口大小以查看效果。</p> <div></div> </body> </html>