.corpo {
	float:left;
	padding-top:20px;
	padding-right:15px;
	clear:left;
	width:455px;
}
.corpo-b1 {
	height:1px;
	font-size:1px;
	background:#aaa;
	margin:0 5px;
	background-color:#ccc;
	width:456px; /* tamanho de b2 menos 4 */
}
.corpo-b2 {
	height:1px;
	font-size:1px;
	background:#fff;
	border-right:1px solid #aaa;
	border-left:1px solid #aaa;
	background-color:#ccc;
	margin:0 3px;
	width:460px; /* tamanho de b3 menos 3 */
}
.corpo-b3 {
	height:1px;
	font-size:1px;
	background:#fff;
	border-right:1px solid #aaa;
	border-left:1px solid #aaa;
	background-color:#ccc;
	margin:0 2px;
	width:463px;/* tamanho real menos  2 */
}
.corpo-b4 {height:2px;
	font-size:1px;
	background:#fff;
	border-right:1px solid #aaa;
	border-left:1px solid #aaa;
	background-color:#ccc;
	margin:0 1px;
	width:465px;/* tamanha real */
}
.corpo-conteudo {
	font-family:Arial;
	font-size:13px;
	border-left:2px solid #aaa;
	border-right:2px solid #aaa;
	display:block;
	width:465px;
	overflow:auto;	
}