Resizable Background image with CSS level 3

Native background image is 900px wide, but it scales to viewport size.

NOTE: this won't work in pre-IE9 browsers. Older browsers will see a white background color and centered background image.

CSS Code:

html {
background: #FFF url(../Images/your-BG-image.jpg) no-repeat center center fixed;
/**for Safari,Chrome**/
-webkit-background-size: cover;
/**for Firefox,Seamonkey**
/ -moz-background-size: cover;
/**for Opera**/
-o-background-size: cover;
/**for other browsers**/
background-size: cover;
}