Show Output
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>CSS Overlaying One DIV over Another DIV</title> <style> .container{ width: 200px; height: 200px; position: relative; margin: 20px; } .box{ width: 100%; height: 100%; position: absolute; top: 0; left: 0; opacity: 0.8; /* for demo purpose */ } .stack-top{ z-index: 9; margin: 20px; /* for demo purpose */ } </style> </head> <body> <div class="container"> <div class="box" style="background: red;"></div> <div class="box stack-top" style="background: blue;"></div> </div> </body> </html>