Coding sprite on WP widget

I know how to do sprites (and know WP pretty well) but I have to add a sprite to the sidebar widget on a WP site and have no clue how to start except that I created the sprite :-). The styles mix me up even when I look via Inspect Element. Can anyone help? Not sure where to start. I Googled it as well but didn’t find anything. Thanks so much.

The widget will be made up of elements with classes/IDs, so all you need to do is find the element you want to place the sprite on, find the nearest class or ID (on the element itself or on a parent element) and you are good to go with your CSS.

Thanks Ralph.