.spaceship {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
  margin-top: -1em;
  position: relative;
  /* No Select */
  touch-action: none;
  pointer-events: none;
  -webkit-touch-callout: none; /* iOS Safari */
  -webkit-user-select: none; /* Safari */
  -khtml-user-select: none; /* Konqueror HTML */
  -moz-user-select: none; /* Old versions of Firefox */
  -ms-user-select: none; /* Internet Explorer/Edge */
  user-select: none; /* Non-prefixed version, currently
                                  supported by Chrome, Edge, Opera and Firefox */
}

.flying {
  -webkit-animation: flying 8s infinite;
  animation: flying 8s infinite;
}

@keyframes flying {
  0% {
    top: 0px;
  }
  10% {
    top: -10px;
  }
  20% {
    top: 10px;
  }
  30% {
    top: -5px;
  }
  40% {
    top: 5px;
  }
  50% {
    top: 0px;
  }
  60% {
    top: 10px;
  }
  70% {
    top: -5px;
  }
  80% {
    top: 10px;
  }
  100% {
    top: 0px;
  }
}