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<!DOCTYPE html> <html> <head> <style> #example1 { border: 2px solid black; padding: 25px; background: url(mountain.jpg); background-repeat: no-repeat; background-size: contain; } </style> </head> <body> <h2>background-size: contain:</h2> <div id="example1"> <h2>Hello World</h2> <p>调整背景图像的大小以确保图像完全可见。</p> </div> </body> </html>