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<!DOCTYPE html> <html lang="en"> <head> <title>CSS Layers Example</title> <style> .container{ position: relative; } .box{ width: 150px; height: 150px; opacity: 0.9; position: absolute; } .red{ background: #ff0000; z-index: 1; } .green{ top: 30px; left: 30px; background: #00ff00; z-index: 2; } .blue{ top: 60px; left: 60px; background: #0000ff; z-index: 3; } </style> </head> <body> <div class="container"> <div class="box red"></div> <div class="box green"></div> <div class="box blue"></div> </div> </body> </html>