svg {
  background-color:transparent;
  z-index: -1;
  position: absolute;

}
#airplane {
  position:absolute;
  left: 10px;
  right:10px;
  z-index: 0;
  top: -10px;
}
circle.flash {
  opacity: .6
}
#contenido {
  position: absolute;
  width: 80%;
  margin:50px 10%;
  z-index: 1;
}
a {
  cursor: pointer;
}
.art {
  cursor: default;
}
.noshow, #airplane.mystyle {
  opacity:.3;
}