I have attempted adding a sky background to my website's stylesheet, but nothing really happened.
body {
background: "sky-08.jpg";
}
It should be: background-image: url("sky-08.jpg");
This also assumes that the image file is in the same location as the CSS file (Or HTML file if it is inline)
If the image is located under an images folder in the root directory: background-image: url("/images/sky-08.jpg");