body {
  font-family:Arial, Verdana;
  background-color:#ffc;
  background-image:url('fondo2.jpg');
  background-attachment:fixed;
  font-size:20px;
}
th {
  font-family:"times new roman";
  color:blue;
  background-color:#6ff;
  font-size:32px;
  font-weight:bold;
  line-height:125%;
  border:2px solid red;
}
.imagen1 {
  float:right;
  margin-right:20px;
  position:relative; left:-40px; top:10px;
}
.imagen2 {
  position:relative; top:-2px;
  margin:6px 25px -8px 2px;
}
.nosabemos {
  font-family:Arial;
  font-size:20px;
  font-weight:normal;
  position:relative; top:6px;
}
.clasetd {
  font-size:22px;
  color:blue;
  text-align:center;
  line-height:160%;
  border:2px solid red;
  background-image:url('fondo3.jpg');
}
.claseweb {
  font-size:21px;
  line-height:140%;
  margin:-2px 0 -3px 0;
}