.agenda {
	border-collapse:collapse;
	border: 1px solid black;
}

.agenda th{
	background-color:#008800;
	color: white;
}
.agenda div{
	position:absolute;
	visibility:hidden;
	background-color:#008800;
	color:white;
	border:1px solid black;	
	width:190px;
}
.agenda th:hover div{
	visibility:visible;
}