| <!DOCTYPE html> | |
| <div style="width:300px; height:200px; border:5px solid black; border-radius:30px; overflow:hidden;"> | |
| <div style="position:relative; left:100px; top:100px; width:500px; height:500px; background:green; will-change:opacity;"> | |
| </div> | |
| </div> |