.contenido_aviso{
	float:left;
	border:1px solid #CCC;
	margin:40px;
	*margin:20px;
	width:910px;
	background:#FFF;
	padding:10px;
}

.contenido_aviso .cabecera{
	float:left;
	color:red;
	padding:5px 0;
	width:100%;
	margin-bottom:10px;
	border-bottom: 1px solid #CCC;
}

.contenido_aviso .contenido{
	float:left;
	color:#333;
	padding:5px 0 30px;
	text-align:justify;
}