Remove Background Image on Calculate Shipping Pop-Up - HOW?

I would like to remove the background image from the pop-up shipping estimator/calculator that pops up when you click the "estimate shipping" button in the shopping cart.

The image that is showing is the same one that is the background image for the website.

It makes it difficult to read the contents of the pop-up with an image in the background. I would like to give it a background color of white.

How can I remove that image and give it the white background color?

http://fishingfrugallures.com/index.php?main_page=popup_shipping_estimator

Thanks for anything you can share.

http://www.zen-cart.com/showthread.php?206718-Changeing-the-back-ground-on-shipping-estimator-pop-up

Thanks!

Here is what I did:

• Go to /includes/templates/YOUR-TEMPLATE-NAME/css/stylesheet.css
• Use the search feature to find "popupShippingEstimator"
• Add "background-image: none;"

It was already coded for the background color to be white, so no adjustment needed for that.

This process also removed the background image from all the popup windows, which was desired.