Not sure if its possible but no harm asking. 

I have a page which shows an invoice. There is an option to void the invoice via a button. What I want is to do create a watermark effect across the page but it has to be on top of the page content. 

I tried using image and CSS background on the invoice container DIV element but that will be hidden if by the invoice content itself. Below is the CSS styles I am using for the class

```
background-image:url(/images/icons/void.png); 
background-repeat:no-repeat; 
background-attachment:fixed; 
background-position:35% 55%;

```

If anyone has any solution, either CSS or Javascript, ... it will be appreciated. Thanks again.