body {
background:#669900;
margin:0;
}

#principal {
width:100%;
float:left;
text-align:center;
}

#cuerpo{
width:920px;
margin:auto;

}
.clo {
	font-family: "Times New Roman", Times, serif;
	font-size: 24px;
	font-weight: bold;
	color: #000;
	margin-right: 170px;
}