How to create a box-shadow that covers the entire page?

Question

the end result that I'm looking for is something like this:

Which was generated with this bkg title:

Is it possible to apply a css3 box-shadow to get the desired output?

I tried:

box-shadow: inset 0 0 490px black;

But that only covers a small part of the screen.

Thanks

user_10144421 · Answer

Shadow on whole page!

box-shadow: 0 0 0 100000px rgba(0,0,0,.2);