css trick for full page background

it will used in small pic who are going to set backgrounds of wenpages(css trick for full page background),already in my site many tricks on css,php and more and more.

                       

background-url('https://www.opendrive.com/files/58027859_ZWb1H/siddhu%20-%20Copy.jpg') no-repeat center center fixed;
-moz-background-size:cover;
-webkit-background-size:cover;
-o-background-size:cover;
background-size:cover;