Hi, I want the background color for Cart Info Help & Shipping Estimator to be white.

This is what I currently have at the end of the CSS file:

#popupShippingEstimator, #popupSearchHelp, #popupAdditionalImage, #popupImage, #popupCVVHelp, #popupCouponHelp, #popupAtrribsQuantityPricesHelp, #infoShoppingCart {
background-color: #ffffff;
}

I think that should work, right? However, I still don't see a white background, I see the main background image used on the site.

Can someone tell me what I need to do to get the background to show white?

Thanks.