body {
  margin: 0;
  width: 100vw;
  height: 100vh;
  background-color: #fff;
  font-family: "Comfortaa", sans-serif;
}

header {
  font-family: "Comfortaa", sans-serif;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
}

a {
  color: #fff;
  text-shadow: 0 0 17px #000;
  text-decoration: none;
  letter-spacing: 0.1em;
  font-family: "Comfortaa", sans-serif;
  font-size: 3em;
  text-transform: uppercase;
  transition: 0.8s;
  text-align: center;
  position: relative;
}
a:hover {
  letter-spacing: 0.5em;
  text-shadow: 15px 15px 0 rgba(0, 0, 0, 0);
  color: #000;
}