<!-- Desactivación de subrayado -->
A:link,
A:visited,
A:active {
  text-decoration: none;
}

<!-- Definición de clases -->

.opcion {
    color: white;
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 15px;
    text-decoration: none
}

.opcion1 {
    color: yellow;
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 15px;
    font-weight: bold;
    text-decoration: none
}

td.menuPpl {
  background: #5471B0;
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
}

td.resaltado {
  background: #FFFFCC;
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
}

td.lados {
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 0px;
  border-right-width: 1px;
  border-bottom-width: 0px;
  border-left-width: 1px;
}

td.arriba {
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 0px;
  border-left-width: 1px;
}

td.abajo {
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 0px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
}

td.caja {
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
}


td.descargas {
  background: #5471B0;
  border-color: #728BC3 #000000 #000000;
  border-style: solid;
  border-top-width: 1px;
  border-right-width: 0px;
  border-bottom-width: 0px;
  border-left-width: 0px;
}