<div class="full granimate"><div>

.granimate {
  background-color: #2ecc71;
  animation: hue 11s linear 0s infinite reverse;
}
.granimate::before {
  background: linear-gradient(105deg, rgba(255, 190, 0, 0), #ffbe00);
  animation: hue 12s linear 1s infinite;
}

@keyframes hue {
  to {
    filter: hue-rotate(1turn);
  }
}

.full {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  color: white;
  font-family: system-ui;
  font-size: 48px;
}
.full::before {
  content: '';
  position: absolute;
  width: 100vw;
  height: 100vh;
}
.full::after {
  content: 'Hue hue hue';
  position: relative;
  text-align: center;
}

body {
  margin: 0;
}

// ¯\_(ツ)_/¯