Apply drop shadow to only part of the container?

...or move adsense code outside container area?

I successfully put my adsense code above my header in the Configure Header Area (style header). I also successfully put a drop shadow around the container in the Layout Container Style area (style layout).

Now I'd like to remove the box shadow from just the adsense part of the container so that the gray ad background blends into the rest of the gray body background, rather than have a shadow separating the two grey areas.

I tried to apply the box shadow to only the header and left/right widget areas to no avail. I just doesn't look right.

I suppose there might be a way to put a widget outside the container and add the adsense code, which may achieve the same desired result, but my testing was unable to get this approach to work.

I also know I could add a background image and create the drop shadow effect but I'm not sure how to create padding for that image if it's to be repeated.

Ideas? Thanks.

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