| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <style> | |
| #back { | |
| width: 800px; | |
| height: 400px; | |
| background-color: yellow; | |
| } | |
| #front { | |
| width: 600px; | |
| height: 200px; | |
| background-color: green; | |
| border: 50px solid blue; | |
| padding: 50px; | |
| -webkit-mask-image: linear-gradient(45deg, white, black); | |
| mask-source-type: luminance; | |
| -webkit-mask-size: 200px auto; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="back"> | |
| <div id="front" /> | |
| </div> | |
| </body> | |
| </html> | |