it will be in a folder in your template
catalog/view/your template/stylesheet/stylesheet.css
and fine the body tab on there ex:
body {
background-image:url('bg.jpg'); color: #000000;
font-family: Arial, Helvetica, sans-serif;
margin: 0px;
padding: 0px;
}
and edit the colour to a image referance
or you can change the container
#container {
background: none repeat scroll 0 0 #FFFFFF;
margin-left: auto;
margin-right: auto;
padding: 0 10px;
text-align: left;
width: 1000px;
}Edit # container#container {
background: none repeat scroll 0 0 #FFFFFF;
margin-left: auto;
margin-right: auto;
padding: 0 10px;
text-align: left;
width: 1000px; background-image: url("../image/bg-body.jpg");
background-position: center top;
background-repeat: repeat-x; }