| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta charset="utf-8"> |
| <style> |
| body, html { |
| width: 100%; |
| height: 100%; |
| } |
| |
| .front { |
| position: fixed; |
| width: 300px; |
| height: 300px; |
| top: 0; |
| left: 0; |
| background: red; |
| opacity: 0.5; |
| color: white; |
| } |
| |
| .back { |
| position: absolute; |
| width: 200px; |
| height: 200px; |
| top: 50px; |
| left: 50px; |
| background: blue; |
| opacity: 0.5; |
| color: white; |
| display: none; |
| } |
| </style> |
| </head> |
| <body> |
| <div class="back">back</div> |
| <div class="front">front</div> |
| <p>Hello world</p> |
| </body> |
| </html> |
