Multiple Box Shadows

It would be nice for rows and columns to have the box-shadow option and even greater it would be to have the ability to add multiple box shadows with different colors. Like in this example: box-shadow: 0 0 0 2px #000000, 0 0 0 5px #ffffff, 0 0 0 9px #000000; It creates a beautiful double border combination. So maybe a simple add button at the box-shadow option.