modifying style.css

Hi, I’m trying to play around with style.css and I changed the body selector in Dashboard editor to:

body {
background-color: rgb(122,222,211);/*ORIGINALLY #000*/
background-image: url(‘images/headers/chessboard.jpg’) no-repeat;/*DELETE ME*/
line-height: 1;
}

But it doesn’t show the chessboard.jpg (btw I just used the WordPress’ Twenty Eleven chessboard img.

Any help appreciated!