html - Changing elements CSS properties based on child element

This is my markup:

    

    
1
    
2
    
»

And I want to change the background-position property of the li element that has a span child with the class current. In this case, the second list item.

I do consider myself proficient with CSS, but I really cannot think of how to do that. Maybe there isn't a way, or I'm just having a brain fart.

Thanks!