This was a little, rounded shadow at the top of a sidebar in the Google Analytics dashboard. I had done something similar that required a little more code so I copied it to see if it could be made more browser independent.
Anyway, here’s the code:
And here’s the result:
Sample file webkit-mask-box-image not found.
Please notify the administrator.
Seems to be reasonably supported by the most modern WebKit browsers and the fallback to a simple gradient in Mozilla and IE is not that bad. I suppose if you were wanting to be thorough you would create an image mask for those browsers that might be supported.