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<!DOCTYPE html> <html> <head> <style> .container { position: relative; } .black-box { position: relative; border: 2px solid black; height: 100px; margin: 30px; } .gray-box { position: absolute; background: lightgray; height: 60px; width: 70%; left: 50px; top: 50px; } .green-box { position: absolute; background: lightgreen; width: 35%; left: 270px; top: -15px; height: 100px; } </style> </head> <body> <h1>元素重叠</h1> <p>如果两个定位元素重叠且未指定 z-index，则 HTML 代码中后定义的元素将显示在顶部：</p> <div class="container"> <div class="black-box">黑色框</div> <div class="gray-box">灰色框</div> <div class="green-box">绿色框</div> </div> </body> </html>