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; }
div { background-image: url("example.com/image.png"); background-size: 100% 100%; }
/* with CSS 3 */ #yourdiv { background: url('bgimage.jpg') no-repeat; background-size: 100%; }