can we apply css for nopcommerce my own colors and background

hi friends can i apply css for nopcommerce shopping cart....

Hi friends I want to apply CSS for my shopping cart where i am working

Of course. You can copy and existing theme folder in /App_Themes and rename it e.g. "/App_Themes/MyTheme"

Then in administration go to Configuration > Global Settings and on the SEO / Display tab set the store theme to your custom theme.

Then you can change the css/skins/images in your custom theme folder  as you wish.