*,
html {
  margin: 10;
  padding: 10;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 10vw;
}

body{
  background-image: url('rhino.jpg');
}
h1 {
  position: relative;
  top: 2em;
  animation: slide-up 3s infinite;
}

@keyframes slide-up {
  0% {
    top: 2em;
  }
  50% {
    top: 0em;
  }
  100% {
    top: 2em;
  }
}