What's the best way to add a shadow effect to sides of page as seen right here?

[RedHotChili]

Originally Posted by Princeton

it really depends on your style but the background image here is done via CSS

html {background:#131D2F url(your-image-here.jpg) center repeat-y}

the height of image is 1px

But what I really need to know is where exactly does this code get inserted? Does it get inserted in the HEADER part of the COMMON TEMPLATES? And if so, how does one exactly embed this particular code in there?

--------------- Added [DATE]1239230866[/DATE] at [TIME]1239230866[/TIME] ---------------

Okay, through trial and error, by placing this code in the Extra CSS Attributes in the Body section I am able to get my 1px high image to load properly. I think.

The image loads completely all the way from top to bottom, though I wish there was some way of making it stop at the bottom edge of the footer.