Google says images styled with CSS won’t be indexed in Image Search, advising developers to use HTML tags for important visuals.

Google's John Mueller said this morning in a webmaster hangout at the 20:55 mark that Google Image search does not index and rank images from CSS background code. He said if you want your images ...

For instance, if you wanted the image to appear to the left of your div, you might use the following CSS: Use an image map if you want certain parts of your image to be clickable links.