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<!DOCTYPE html> <html> <head> <style> .container { position: relative; } .black-box { position: relative; z-index: 1; border: 2px solid black; height: 100px; margin: 30px; } .gray-box { position: absolute; z-index: 3; /* 灰色框将位于绿色框和黑色框之上 */ background: lightgray; height: 60px; width: 70%; left: 50px; top: 50px; } .green-box { position: absolute; z-index: 2; /* 绿色框将位于黑色框之上 */ background: lightgreen; width: 35%; left: 270px; top: -15px; height: 100px; } </style> </head> <body> <h1>Z-index 实例</h1> <p>堆叠顺序较高的元素始终位于堆叠顺序较低的元素之上。</p> <div class="container"> <div class="black-box">黑色框 (z-index: 1)</div> <div class="gray-box">灰色框 (z-index: 3)</div> <div class="green-box">绿色框 (z-index: 2)</div> </div> </body> </html>