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<!DOCTYPE html> <html> <head> <style> body { background-color:#E7E9EB; } #myDIV { width:100%; position:absolute; height:300px; background-color:#FFFFFF; } #myDIV div{ width:100px; height:100px; position:absolute; background-color:yellow; border:1px solid; opacity:0.5; } #myBox { position:absolute; background-color:red!important; opacity:1!important; z-index: 2; } </style> </head> <body> <h1>The z-index property</h1> <div id="myDIV"> <div id="myBox">myBox</div> <div style="top:20px;left:20px;z-index:0;">z-index 0</div> <div style="top:40px;left:40px;z-index:1;">z-index 1</div> <div style="top:60px;left:60px;z-index:2;">z-index 2</div> <div style="top:80px;left:80px;z-index:3;">z-index 3</div> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>