Centering anything requires setting a width less than 100% for the container. Example:
body {
width: 950px;
height: 600px;
margin: 0 auto;
background: #fff url(path to non-tiled image) no-repeat center scroll;
}
Change parameters as you need. Set "#fff" to background color you want. Set "scroll" to "fixed" if you want page contents to scroll over background image. CSS was given for an image that does not tile.
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