background image that moves when you scroll down the page

Question

I keep seeing websites with a background image that subtly moves when you scroll down. This is a really nice effect but I\'m not sure how to do this? I\'m am experienced with

Answer 1

Or you could use this simple CSS property which I made a blog post about: http://nathanpeixoto.fr/blog/article8/web-un-one-page-presque-sans-javascript (French only, sorry).

Let's say this is your HTML: