* {
  margin: 0;
  padding: 0;
  font-family: 'Courier New', Courier, monospace;
}

.navigation {
  background-color: purple;
  transform: translateY(-100%);
  animation-name: jump;
  animation-iteration-count: infinite;
  animation-duration: 3s;
  position: absolute;

}

.menu li {
  color: white;
  font-size: 20px;
  font-weight: bold;
  padding: 10px
}

@keyframes jump {
  0% {
    transform: translateY(-100%);
  }
  50% {
    transform: translateY(0%);
  }
  100% {
    transform: translateY(-100%);
  }
}