Auto resized background image

We can do this purely through CSS thanks to the background-size property now in CSS3. We’ll use the html element (better than body as it’s always at least the height of the browser window). We set a fixed and centered background on it, then adjust it’s size using background-size set to the cover keyword.

* { margin: 0; padding: 0; }

html {
background: url(../images/home.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}