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<!DOCTYPE html> <html> <head> <style> #div1 { position: absolute; left: 50px; width: calc(100% - 100px); border: 1px solid black; background-color: yellow; padding: 5px; text-align: center; } </style> </head> <body> <h1>calc() 函数</h1> <p>创建一个横跨窗口的 div，div 的两侧和窗口的边缘之间有 50px 的间隙：</p> <div id="div1">一些文字...</div> </body> </html>