I have added lines like ittybittykittly's thread but it is not working. here is what I have:

body {
margin: 0;
font-family: verdana, arial, helvetica, sans-serif;
font-size: 62.5%;
color: #000000;
background-color: #e5edf5;
background-image: url(../images/back.jpg);
background-repeat: no-repeat;
background-position: center top;
}