#tabla_principal
{
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
}
#loader
{
  position: fixed;
  width: 100%;
  left: 0px;
  top: 0px;
  height: 100%;
  text-align: center;
  display: none;
  z-index: 3;
  font-size: 3vh;
}
#loader img
{
  width: 20vh;
}
#loader a
{
  background-image: url('../imagenes/WGBG.png');
  padding: 1vh;
  border-radius: 50vw;
}
#popup
{
  position: absolute;
  background: #fff;
}