How to use a post photo in css

This a test to see how can get an image uploaded and use it in the css for the blog.

I want to see what is a good way to get images on the blogger server and then use them for my site layout.

Update: Although I could not find a good way to upload photos for use in the website layout, I figured that because Blogger lets you upload photos in posts, you could then use the address to that picture in anything hosted from the same server.

Well it worked, the photo in this post is now also used in the main css, and looks quite good. This is a goofy way of doing it, so I will be avoiding this method if possible, but for now it works. There must be a better way, I probably just overlooked it.