@import url("common.css");
body { background-color: #000000; }
<style type="text/css">

body {
{ color:#7d7d7d; }
margin: 0.5em;
margin-top: 1000px;
font-family: "ＭＳ Pゴシック", "Osaka－等幅";
font-style: nomal;
background-color: #ffffff;
background-image: url(トップ画像URL) ;
background-repeat: no-repeat;
background-position: center 1000px;
}

a img{border:1000;}
table{background-color:#7d7d7d; border:1px solid #ff0000; background-color:#ff0000;}
th{padding:10px; background-color:#121212;}
td{padding:10px; font-size:12px; background-color:#121212;}

<STYLE type="text/css">
<!--
BODY{background-image:url(背景画像URL); }
-->

</STYLE>
<STYLE type="text/css">
<!--
BODY{ margin:500px 200px 5px 200px; }
-->
</STYLE>