html {
  height: 100%;
  animation-name: background;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  font-family: futura;
}

.invert {
  filter: invert(100%);
}

a {
  text-decoration: none;
}

h3 {
  color: goldenrod;
}

@keyframes background {
  0% {
    background-color: pink;
  }
  25% {
    background-color: blue;
  }
  50% {
    background-color: goldenrod;
  }
  75% {
    background-color: magenta;
  }
  100% {
    background-color: pink;
  }
}