*,
html {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 10vw;
  text-transform: uppercase;
}

body {
  position: absolute;
  left: 50%;
  top: 25%;
  transform: translate3d(-50%, -50%, 0);
  overflow: hidden;
}

h1 {
  position: relative;
  top: 2em;
  animation: slide-up 3s infinite;
}

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