set background image fill code example
Example 1: CSS make image fill whole background
html {
background: url(images/bg.jpg) no-repeat
center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
Example 2: background image fill div
div {
background-image: url("example.com/image.png");
background-repeat: no-repeat;
background-size: cover;
}