<style>
#mainDiv {
height: 100%;
width: 100%;
background-image: url(/graphics/myImage.jpg);
background-position: 50% 50%;
background-repeat: no-repeat;
padding: 20px;
font-family: Arial;
font-size: 14px;
font-weight: bold;
}
</style>
<div id="mainDiv">
Four score and seven years ago, our fathers brought forth to this country, a new nation,
conceived in liberty and dedicated to the proposition that all men are created equal.
</div>
Any div can have a background image, just as the BODY can. Lookup background-image and associated CSS declarations for more data.