body, p, td, a, .firma {
  font-family: helvetica, verdana, lucida, arial, sans-serif;
}
body, p, td {
  background-color: white;
  color: black;
}
:link { color: #0000EE }
:visited { color: #663399 }
:active { color: #FF0000 }
.firma {
      font: smaller sans-serif;
      text-align: center;
      margin: 5px;
}
.piefoto {
      font: smaller sans-serif;
      text-align: center;
}
.nav-texto {
      text-align: center;
      margin: 5px;
}