How to make a static background on the whole site

Click on the image to see the video :-)

Add this to your template's common.css

body {
    background-attachment: fixed;
}

Hi thank you so much, i did it and the first page is ok.
But the other pages not. It takes time?

I did cache clean... have i to wait?

Didier 

ok, i did also general.css , now it's ok. :-)