Fatto
codice:
body {
font-family: "Trebuchet MS";
font-size: 13px;
background: url(images/back.jpg) repeat-x #800000;
text-align: center;
margin-top: 0;
}
.corpo {
width: 900px;
text-align: left;
margin: auto;
margin-top: 18px;
}