Hi,
The CSS is OK upto a point, but what is the selector name?
Also you need height and width to see the image, assuming that you want the image to run the full width of the page you would need to add width: 100%; and because the image is only small it still needs height, so you will need to add height: 25px;. But of course this all depends on the container you are adding this to assuming there is a container that the image can run the full width of?
Hope this helps.
Cheers
Mary