The actual body on the webpage you provided has no shadow its just the effect the image and container have. Without seeing all your code I would have no idea what to say.
This is the section your container is within the id="" is giving the div a dynamic name which you can call in your CSS file.
Look in the template you downloaded there should be a .CSS file. Drag this file into an open blank notepad/notepadd++ or what ever text editor you are using.
Within the CSS file your looking for the
This is where you add the CSS styling. If you want copy the .container_wrap and post it on here.
Example three is what you wan