HTML 5 And CSS 3

Fullscreen Backgrounds With CSS3

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1. html {   
2.     background: url('images/bg.jpg') no-repeat center center fixed;   
3.     -webkit-background-size: cover;  
4.     -moz-background-size: cover;  
5.     -o-background-size: cover;  
6.     background-size: cover;  
7. }  

http://www.hongkiat.com/blog/css-snippets-for-designers/