I'm completely new to CSS, so pardon the ignorance of this question.
Let's assume that I have a gif of a map that changes daily (a satellite image, for instance). Is there a way to use CSS to overlay a polygon over a predefined area of the gif? For example...let's assume I want to place a rectangle over the Grand Canyon. The backgound gif will change from day to day, but the x-y location of the Grand Canyon (and thus, the rectangle) will always be the same. With each successive gif image, I want the rectangle(s) to display in the exact same spot, with no user intervention. How can I accomplish this?
"Barney-style" examples greatly appreciated!