Adding a Box Shadow

This is a tricky one... IMHO
because GP does not have a "main" container to which you can apply a box-shadow property.

Something like this may help: http://generatepress.com/forums/topic/drop-shadow-around-site/

@Roberto - how about adding an opening div with a class in the Before Header hook, and closing it in the wp_footer hook. Then you can apply the box shadow to that class :)

Oh! That was a pretty nice one ;-)

Thanks guys this is perfect!