body {
  font-family: sans-serif;
  font-size: 2em;
  background-color: black;
  margin: 2em;
  color: white;
}

@keyframes hueRotateAnimation {
  from {
    filter: hue-rotate(0deg);
  }
  to {
    filter: hue-rotate(360deg);
  }
}

img {
  animation: hueRotateAnimation 4s linear infinite;
}