body {
  margin-top:0px;
  margin-left:0px;
  font-family:Arial;
  background-image: url('fondo1.png');
  background-size: cover;
  background-repeat: no-repeat
}

table.principal {

   color: black;
   width: calc(100% - 20px);
}

thead {
	display: table-header-group;
	background: rgba(23,102,55,0.8);
	position: sticky;
	top: 0;
}

thead.td, thead.img {
	height: 60px;
}

a {
	text-decoration: none;
	color: blue;
}

tfoot {
	display: table-footer-group;
	position: sticky;
	bottom: 1px;
	height: 30px;
	text-align: center;
	color: white;
	background: rgba(23,102,55,0.8);
}

tr.filcon {
	display: table;
	width: 100%;
	table-layout: fixed;
	background: rgba(255,255,255,0.7);
}

b.btit {
	display: block;
	margin: 4px;
	text-align: left;
	font-size: 16px;
}
img.imaco {
	height: 120px;
	margin: 4px;	
}

#contenedor {
   display: block;
   width: calc(100% - 20px);
   height: 400px;
   border-radius:12px;
	padding: 6px;
   border: 2px inset green;
   overflow-y: auto;
}