The only place the color #80baff is used is in your body color and your main wrapper. However you have formatted a background color not only in your style sheet but also on your page viewable on your source codes.
I ran you through the ww3 and this is what they say.

  • Line: 21 Context : CSS Parse Error - - http://store.ultradyna.com/index.php http://store.ultradyna.com/index.php http://store.ultradyna.com/includes/...stylesheet.css body { margin: 0; font-family: verdana, arial, helvetica, sans-serif; font-size: 70%; color: #000000; background-color: #80baff; }
  • Line: 140 Context : .clearBoth Invalid number : line-height Parse Error - [empty string]
  • Line: 651 Context : .cssButtonHover Parse Error - ://store.ultradyna.com/includes/templates/utl/css/stylesheet_css_buttons.css .cssButton
  • Line: 674 Context : .cssButton, .cssButtonHover Property _width doesn't exist : 0
  • Line: 713 Parse Error - ://store.ultradyna.com/includes/templates/utl/css/print_stylesheet.css body
take care of these errors and then address any problems that remain after the fixes.

After you have made your fixes you will want to check your style sheet for errors after making changes.
http://jigsaw.w3.org/css-validator/

It also looks like you have 2 print style sheets use only one also any style sheet that you put in your style sheet folder will be read so make sure you only have 1 with the styles you want to use.