You will have to clarify what you mean as I am not following what you want to do
If possible a codepen demo or similar would help and then we can work with your code and your images.
It sounds like you have removed an image from the html and turned it into a sprite. If so then you will need to size the element to match your sprite dimensions (same as the original image I guess) and apply the background-position code given to you by the generator (although I have not used the generator so don;t know what you’ve been given exactly).
Be aware that if the image is deemed as content then it should be in the html and not in a sprite.
You need to have the image as a background image rather than an inline image. Changing the background position when you have no background isn’t going to change anything.
It may be possible to apply the background to v-top but as you don’t show the code for that element we can’t tell if it can be used.
You also don’t show the code that displays the actual image so I’m guessing its called something like .example but once again you don’t provide enough information for us to help.
Please read my first post and supply the information in a form that will allow us to help you more easily. What you are asking is one of the simplest things to do in CSS but without code or context we can’t give specific help.
Also note that the main point of using sprites is to remove the unnecessary images from the html and combine them into one big sprite to save loading time. It is not meant for replacing images that should remain in the html as content. Neither is it a method of applying a sprite image to a foreground html image (although that can be done but is complicated and rarely useful).