how to define backrounf imege 100% of the screen code example
Example 1: css background image cover
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: 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;
}